This guide has been shamelessly taken from https://www.nookgaming.com/white-album-memories-like-falling-snow-walkthrough-guide/ and is over a year late since release here, but for convenience sake I'm publishing it anyway

Yuki

Note: Requirements for Yuki’s Valentine achievement are particularly strict as the required points are higher than most. Be sure not to miss any events or conversations, including the ‘hidden’ ones found in this guide.

Skip Prologue (Optional)

11/6 – Nimi Station

Conversation Option: Romance

11/7 – Mana’s House (Event)

Fine. We’re done

See you next time

11/8 – Park

Conversation Option: Romance

11/11 – College

Conversation Option: Hobbies

Let’s go (+ Heroine Point)

Can you go for me? (if this appears in a dialogue with Haruka in the evening)

11/12 (Event)

Turn her down

Should Trigger Achievement: A Date with Yuki

11/13 – Park

Conversation Option: Hobbies

It’s a date (+ Heroine Point)

11/14 – Park

Conversation Option: Small talk

Can you go for me?

11/16 – Park

Conversation Option: Literature

Sure

11/20 – College

Conversation Option: Literature

Let’s do it (+ Heroine Point)

11/21 – TV Station

Conversation Option: Entertainment

11/29 (Event)

Not really… (+ Heroine Point)

11/30 (Event)

The theater club play

12/1 – TV Station (Rina Conversation)

Conversation Option: Literature

Say yes (+ Heroine Point)

12/3 (Event)

Of course I’m down for it (+ Heroine Point)

12/6 – TV Station

Conversation Option: Entertainment

12/7 – TV Station

Conversation Option: Entertainment

12/15 – College

Should Trigger Achievement: Yuki’s Ministrations

Conversation Option: Small talk

12/16 – College

Conversation Option: Small talk

12/23 – Home (Event)

12/24 (Event)

That’s just how it goes sometimes (+ Heroine Point)

12/25 (Event)

Accept her apology

1/2 – TV Station (Event)

1/5 – Echoes (Event)

1/19 – Echoes (Event)

Stop them (+ Heroine Point)

2/2 – TV Station

Conversation Option: Literature

2/4 – Echoes

Conversation Option: Literature

2/10 – TV Station

Conversation Option: Hobbies

2/12 – Echoes

Conversation Option: Small talk

2/14 – Echoes (Event)

Should Trigger Achievement: True Valentine (Note: This can be easy to miss if you don’t get some bonus Yuki points)

2/22 – TV Station (Event)

Get her attention

2/24 – Echoes

Conversation Option: Small talk

2/25 – Echoes

Conversation Option: Small talk

2/27 (Event)

I’m coming over.

Rina

Skip Prologue (Optional)

11/6 – Echoes

Conversation Option: Literature

11/7 – Echoes

Conversation Option: Entertainment

I do worry about her (+ Heroine Point)

11/11 – TV Station (Event)

11/13 – TV Station (if you haven’t unlocked Sayoko yet)

Conversation Option: Hobbies

11/14 – TV Station (if you haven’t unlocked Sayoko yet)

Conversation Option: Literature

11/15 -Echoes (if Rina is there)

Conversation Option: Hobbies

11/16 -Echoes (if Rina is there)

Conversation Option: Literature

11/19 – Downtown (Event)

11/20 – TV Station

Conversation Option: Hobbies

11/21 – Echoes

Conversation Option: Entertainment

11/22 – TV Station (Event)

Sure

11/23 (Event)

Of course I’ll go (+ Heroine Point)

11/27 – TV Station

Conversation Option: Romance

11/28 – TV Station

Conversation Option: Literature

11/29 (Event)

Yeah…

12/4 – Echoes

Conversation Option: Small talk

12/5 – Echoes

Conversation Option: Romance

12/13 – TV Station

Conversation Option: Small talk

12/14 – TV Station

Conversation Option: Romance

12/18 – Echoes

Conversation Option: Romance

12/19 – Echoes

Conversation Option: Romance

I’ll come (+ Heroine Point)

12/24 (Event)

That sucks

12/25 (Event)

Play dumb

1/2 – TV Station (Event)

1/4 – TV Station

Conversation Option: Small talk

1/13

Should Trigger Achievement: Rina’s Ministrations

1/19 – Echoes (Event)

You’re overthinking this (+ Heroine Point)

1/26 (Event)

Stop her

2/14 (Event)

Should Trigger Achievement: Rina’s Valentine

2/17 – TV Station

Conversation Option: Romance

2/20 – TV Station

Conversation Option: Hobbies

I’m free (+ Heroine Point)

2/21 (Event)

Go after her

Sayoko

Note: Unlike the other ‘route guides’, this will unlock every event for Sayoko. Sayoko’s conversations also do not appear until 11/26, so do not be concerned that you only see events until then.

First, complete the Rina or Yuki ending. Sayoko will not appear otherwise

Skip Prologue (Optional)

11/6 – TV Station (Event)

Chat with him

11/11 – College (Event)

11/14 – College (Event)

11/17 – College (Event)

11/22 – TV Station (Event)

11/24 – College (Event)

11/25 – College (Event)

11/26 – Nimi Station

Conversation Option: Entertainment

11/27 – Nimi Station

Conversation Option: Entertainment

11/28 – Nimi Station

Conversation Option: Entertainment

11/29 – TV Station

Conversation Option: Romance

Yeah…

12/4 (Event)

Sure (+ Heroine Point)

12/5 – Sports Arena

Conversation Option: Hobbies

12/6 – Sports Arena

Conversation Option: Hobbies

12/8 – College

Conversation Option: Literature

12/9 – College (Event)

12/12 – (Phone Call Event)

Go (+ Heroine Point)

12/14 – Downtown

Conversation Option: Literature

12/15 – TV Station (Event)

12/17 – TV Station

Conversation Option: Small talk

12/18 – TV Station

Conversation Option: Small talk

12/19 – College (Event)

12/20 – TV Station

Conversation Option: Small talk

12/21 – Nimi Station

Conversation Option: Romance

12/22 – TV Station (Event)

I’m free (+ Heroine Point)

12/24

That sucks…

12/25

Get angry

1/3 (Event)

Go to Nimi Station

1/10 – TV Station (Event)

Follow her (+ Heroine Point)

1/11 – Sports Arena

Conversation Option: Romance

1/15 – TV Station (Event)

1/16 – Sports Arena

Conversation Option: Romance

1/17 – Sports Arena

Conversation Option: Romance

1/18 – TV Station (Event)

1/19 – Sports Arena

Conversation Option: Romance

1/23

Should Trigger Achievement: Sayoko’s Ministrations

1/24 – TV Station

Conversation Option: Romance

1/27 – Sports Arena

Conversation Option: Romance

2/3 – Nimi Station (Event)

Mana

Note: In this route, you’ll see the same event multiple times at Mana’s House. This will gain you points each time.

Do not skip the prologue as can gain bonus point

11/4

Keep talking (+ Heroine Point)

11/7 – Mana’s House (Event)

Fine we’re done (+ Heroine Point)

See you next time

11/9 – Downtown

Conversation Option: Hobbies

I prefer your normal clothes (+ Heroine Point)

11/11 – Park

Conversation Option: Entertainment

11/13 – Downtown

Conversation Option: Hobbies

I like sports (+ Heroine Point)

11/14 – Mana’s House (Event)

Good enough. Let’s go do something else (+ Heroine Point)

11/15 – Downtown

Conversation Option: Entertainment

11/21 – Mana’s House (Event)

Sure. Let’s go

11/22 – Park

Conversation Option: Hobbies

11/23 – Downtown

Conversation Option: Literature

11/27 – Downtown

Conversation Option: Literature

11/28 – Mana’s House (Event)

I’m going by myself

Wanna come with me? (+ Heroine Point)

11/29 (Event)

Theater club play (+ Heroine Point)

11/30 – Downtown

Conversation Option: Literature

Sure (+ Heroine Point)

12/4 – Downtown

Conversation Option: Romance

12/5

Should Trigger Mana Date Achievement

12/7 – Park

Conversation Option: Hobbies

12/11 – Downtown

Conversation Option: Literature

12/12 – Mana’s House (Event)

Wanna talk? (+ Heroine Point)

12/13 – Park

Conversation Option: Literature

12/19 – Mana’s House (Event)

Worry about you, Mana (+ Heroine Point)

I’m spending it alone (+ Heroine Point)

12/20 – Downtown

Conversation Option: Romance

12/21 – Downtown

Conversation Option: Romance

You’re just so cute (+ Heroine Point)

12/24 (Event)

I dunno

Don’t shake his hand

12/25 (Event)

Offer her a piece of chicken (+ Heroine Point)

Let her stay a little longer (+ Heroine Point)

Get you some medicine (+ Heroine Point)

12/27 (Event)

Fine… (+ Heroine Point)

Turn her down

Hold her hand (+ Heroine Point)

12/28 (Event)

How are you feeling today? (+ Heroine Point)

12/29 (Event)

Kiss her

1/3 – Downtown

Conversation Option: Small talk

1/4 – Downtown

Conversation Option: Small talk

1/5 – Downtown

Conversation Option: Small talk

1/8 – Ibukicho Station

Conversation Option: Small talk

1/9 – Mana’s House (Event)

I wished for luck in love (+ Heroine Point)

1/10 – Ibukicho Station

Conversation Option: Small talk

1/15 – Downtown

Conversation Option: Hobbies

1/16 – Mana’s House (Event)

Wanna talk? (+ Heroine Point)

1/19 – Downtown

Conversation Option: Hobbies

1/23

Should Trigger Achievement: Mana’s Ministrations

1/24 – Downtown

Conversation Option: Hobbies

1/27- Downtown

Conversation Option: Hobbies

1/29 – Downtown

Conversation Option: Romance

1/30 – Mana’s House (Event)

Wanna talk? (+ Heroine Point)

2/1 (Event)

I have time

I’ll go with you (+ Heroine Point)

2/5 – Downtown

Conversation Option: Hobbies

2/6 – Mana’s House (Event)

Wanna talk? (+ Heroine Point)

2/7 – Downtown

Conversation Option: Literature

Good then (+ Heroine Point)

2/13 – Mana’s House (Event)

Wanna talk? (+ Heroine Point)

I’m free (+ Heroine Point)

(Note: Save before the following step and choose anywhere other than Home to see an alternate event, then load)

2/14 – Home (Event)

Should Trigger Achievement: Valentine’s With Mana

2/16 (Event)

You should spend time with your cousin

I’ll go with you (+ Heroine Point)

2/17 (Event)

Chase after Mana

Hug her

Misaki

Skip Prologue (Optional)

11/6 – College (Event)

Go with Misaki to the library (+ Heroine Point)

11/9 – Downtown

Conversation Option: Literature

11/11 – Echoes

Conversation Option: Hobbies

Let’s do it (+ Heroine Point) (Note: It sounds like this should trigger an event on 11/15 from the dialogue, but it actually triggers on 11/22)

11/13 – College

Conversation Option: Literature

11/14 – College

Conversation Option: Romance

11/17 – College (Event)

I’m free (+ Heroine Point)

Let me help (+ Heroine Point)

11/20 (Event)

No

11/21 – Ibukicho Station

Conversation Option: Romance

11/22

Should Trigger Achievement: A Date with Misaki

11/23

Conversation Option: Small talk

11/25

Should Trigger Achievement: See Misaki’s sick visit event

11/29 (Event)

Yeah

12/1 – Home (Event)

Call her

12/2 – Home (Event)

Call her

12/3 – Home (Event)

Call her

12/4 – Home (Event)

Call her

12/5 – Home (Event)

Call her

12/6 – College (Event)

12/7 (Event)

Call Her

12/8 (Event)

See ya

Let’s walk home together after class (+ Heroine Point)

Wanna hang out for a little longer? (+ Heroine Point)

Ask Misaki to hang out on Christmas Eve (+ Heroine Point)

12/11 – College

Conversation Option: Literature

12/12 – Ibukichi Station

Conversation Option: Literature

12/18 (Event)

Choose Anything

12/19 – College

Conversation Option: Small talk

12/20 – Park

Conversation Option: Literature

12/24 (Event)

I’m not going (+ Heroine Point)

Yes

Don’t shake his hand

12/25 (Event)

Go look for her

1/8 – College (Event)

Wait for her

1/11 – Downtown

Conversation Option: Romance

1/12 – Ibukicho Station

Conversation Option: Romance

1/13 – Downtown

Conversation Option: Entertainment

1/15 – College

Conversation Option: Literature

1/16 – Ibukicho Station

Conversation Option: Literature

1/22 – Ibukicho Station

Conversation Option: Small talk

1/23 – Mana’s House (Event)

Nope, not yet

See you next time

1/24 – Downtown

Conversation Option: Hobbies

1/26 – Nimi Station

Conversation Option: Literature

Chase her down

1/29 – College

Conversation Option: Small talk

2/2 – College (Event)

Go after Misaki (+ Heroine Point)

(Note: Save before the following step and choose Home for 2/14, view the event, then load)

2/14 – Echoes

Conversation Option: Literature

It’s fine

Go after her

2/27 (Event)

Yes

2/28 (Event)

Sure

I really like her.

Haruka

Skip Prologue (Optional)

11/11 – Park

Conversation Option: Entertainment

11/12 – College (Event)

11/13 – Park

Conversation Option: Literature

11/14 – Sports Arena

Conversation Option: Small talk

11/20 – College

Conversation Option: Literature

11/24 – Sports Arena

Conversation Option: Romance

I don’t think so (+ Heroine Point)

11/27 – Sports Arena

Conversation Option: Hobbies

11/28 – Sports Arena

Conversation Option: Small talk

11/29 – College (Event)

I might be free

Go (+ Heroine Point)

Yeah

12/5

Should Trigger Achievement: Haruka’s Ministrations on the following morning

12/6 – Sports Arena

Conversation Option: Hobbies

Sure, I’ll go (+ Heroine Point)

12/7 – Sports Arena

Conversation Option: Small talk

12/10

Should Trigger Achievement: A Date with Haruka

12/11 – College (Event)

What are you doing here? (+ Heroine Point)

12/12 – Sports Arena

Conversation Option: Hobbies

It would (+ Heroine Point)

12/14 – Sports Arena

Conversation Option: Hobbies

12/18 – College

Conversation Option: Hobbies

12/19 – Sports Arena

Conversation Option: Hobbies

12/24 (Event)

Kiss her

Don’t go

Yes

Don’t shake his hand

12/25 (Event)

Go look for her

1/8 – College (Event)

Wait for her

I am thinking about it

1/12 – College (Event)

Push it (+ Heroine Point)

1/26 – Sports Arena

Sure (+ Heroine Point)

2/14 – Ibukicho Station (Event)

Sure, I’ll go (+ Heroine Point)

2/20 – Ibukicho Station (Event)

Bring her inside

I’m sure

2/21 (Event)

Yes

Yayoi

(Note: You will need to go partway onto Yuki’s route for this route to start, so do not be concerned about seeing many Yuki events. That said, if straying from this guide, be careful not to see too many Yuki events or conversations not mentioned here)

Skip Prologue (Optional)

11/6 – TV Station (Or Nimi Station if Sayoko is unlocked)

Conversation Option: Entertainment

11/8 – Park

Conversation Option: Romance

11/13 – Echoes

Conversation Option: Small talk

11/14 – Echoes

Conversation Option: Entertainment

11/15 – TV Station (Or Ibukicho Station is Sayoko is unlocked)

Conversation Option: Entertainment

11/16 – TV Station

Conversation Option: Hobbies

Let’s go

I’ll go myself

Cancel my plans with Yuki

Apologize

11/20 – TV Station

Conversation Option: Entertainment

11/27 – Echoes

Conversation Option: Literature

11/29 (Event)

Not really…

11/30 (Event)

The theater club play

12/1 – TV Station

Conversation Option: Hobbies

Say yes

12/3 (Event)

Of course I’m down for it

12/8 – Echoes

Conversation Option: Entertainment

12/10 – Echoes

Conversation Option: Entertainment

I’ll accompany you(+ Heroine Point)

12/11 – Echoes

Conversation Option: Literature

12/12 – TV Station

Conversation Option: Hobbies

12/14

Should Trigger Achievement: A Date with Yayoi

12/15 – TV Station (Event)

12/19 – TV Station

Conversation Option: Small talk

12/21 – TV Station

Conversation Option: Small talk

12/24 (Event)

No

Do you want to come up for a few minutes? (+ Heroine Point)

Sleep with her

12/26 – TV Station

Conversation Option: Romance

1/2 – TV Station (Event)

What kind of person do you think I am? (+ Heroine Point)

1/16 – Echoes (Event)

Go with her (+ Heroine Point)

1/21 – Echoes (Event)

Go with her (+ Heroine Point)

1/29

Should Trigger Achievement: A Date with Yayoi

2/4 – Echoes (Event)

Go with her (+ Heroine Point)

2/11 – Echoes (Event)

Talk to her

2/27 (Event)

I do

Thank you to Thomas Knight of nookgaming for creating this guide (the only one in English that I could find)