When i first launched the game, it asked to download 600 Mb. When i will decide to delete the game i don't want it to leave 600 Mb of data, where this package was downloaded ?

according to their social media.

I'm curious as to what ways is absolutely required to buy other than item storage in this game, like in toram there were weapon/armor piercers that typically needed either absurd normal currency farming to buy from another player or you had to risk the gambling banners. You also needed shared item storage in that game as well. also the steam release date, because their console and steam release icons on their official website are grayed out....

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https://www.p-eternal.jp/en/