Not all friends last forever, even if they're really close, somehow we always end up losing them, because the bond between us wasn't true....... And that's why I'm here today at this school all because of one betrayal. My name is Kat Rozu, I've just transferred to a school called Nightingale High school, the second best music school in Tokyo city. I may be four months late but I got a feeling that this school will be a lot different than the last.