Kokoro...

Kuonji Souji seems to have it all going for him. He is handsome, popular and excels at his club activities. His past is another thing altogether -- as a boy, he was raped repeatedly by his foster parents. The years have passed, and he has tried to forget by repressing those memories. They are still there, though, and come to him as hallucinations. Who is the raven-haired beauty he keeps seeing in those visions? Does she hold the key to unlock his past?

[Taken from AniDB]

P.S.: The game contains 24 endings.