Played this on mobile before. The story is actually good. I especially love the twist at the end. The afterstory is unnecessary though. Not that bad but worse than the main one.
oh i played that game on android before, so yes, its a mobile game port, but i dont think it matters as this is basicaly a visual novel, a pretty good and intresting one too, so yeah i can recomend it.
https://play.google.com/store/apps/details?id=com.HirayaSpace.SevenYears&hl=en&gl=US
https://youtu.be/sZhzMC5mxho
worthwhile