YMMV / LUNA (RPG Maker)

• The Woobie: Lucy was the favorite of her parents, but loved her sister Luna just as much. Unfortunately, because Luna was The Unfavorite, she used a magic book given to her to trap Lucy inside and erase all traces of her, so Luna becomes the beloved only child while Lucy is trapped in the void forever, and can do nothing but scream and cry for her parents. So when the seal weakens, she decides to seek revenge on Luna. And neither of the two endings definitively end well for her- in the normal end, Luna escapes and leaves her trapped forever, while the secret end can be interpreted as her managing to escape, but is too ambiguous to tell.