Koge Donbo : Pavane for a Dead Girl (Naki Shoujo no Tame no Pavane)

Takenomaru is a violinist prodigy on a quest. At the music school where his adoptive father teaches, he pursues twelve girls to attain the twelve tears of Maria as part of a contract. To do so, he gives them each a brooch that changes color according to their feelings for him and makes them fall in love with him, enabling him to attain a tear. But shortly afterwards, the girls will face death...