Does anyone know where the save data is?

Hi everyone, so I just used the blue rocket and it brought me to a planet which looked like home earth. I didnt find anything to do there, can somebody please give me some advice on that?

既に3回ほど転生してますがseedアップグレード が解放されません。 初期化してもいいので何かやり方は無いものでしょうか・・・？

Topic.

I just got my second skill card which enables me to shoot a fireball or something, but it says it requires 3 stamina. I don't see any indication in my hud that I am creating stamina, and I don't seem able to shoot the fireball. Is there another skill card perhaps that enables the collection/generation of stamina?...