Toman

Set after the drama series "Meiji Tokyo Renka." High school student Mei Ayazuki (Rikka Ihara) has travelled back in time to Tokyo in the Meiji period. She meets various historical figures from that time period. The identity of mysterious magician Chari (Yutaka Kobayashi) is revealed. (via Asianwiki)

A group of boys and girls, twelve in total, gather at an abandoned hospital to die for various different reasons. There, they find the body of a dead boy. The group of twelve attempt to find the person who killed the boy. During their search, the reasons why they want to die are revealed.