Identify trying to remember game, help please?

[xxxxdave]

I remember four things about the game:

The main girl had black hair, green eyes and a curvy body

She is murdered and you get thrown back in time to the start of the day

You are consoled by a nun with black skin

It takes place in school with red uniforms

Any help would be appreciated

 

[LGM]

Time Implosion