MC with a tragic past

As i said, i Love the way of opening up over time, or start to heal.

The worst the past the better.

the locaion should be 2 girls that go to school, its also fine if no one even no about the tragical past so the MC doesnt have to show it, like in bloom into you, but yeah if you know any Manga that is like that I would really appreciate recommendations,

thanks alot