Graces: Posthumous Wish

Day after day, Aki suffers from constant misfortunes. Her classmate Mitsuki is convinced that all the trouble is caused by a curse. And she knows how to stop it. However, Aki doesn't get a chance to ask her for details: Mitsuki mysteriously dies. Rumor has her death is the fault of some girl. In an attempt to understand what has happened, Aki decides to perform a dark ritual called "Posthumous wish", which might help her solve the mystery of Mitsuki's death and find a way to break the curse. Meanwhile, the entire town is already entangled with the vines of a strange plant.