Sanae Horikawa

Taison Maeda's Teiken High School class goes on a field trip to the Kansai region of Japan, which is where Taison is from. Taison's little brother Youkou sent a message to Taison & his older brother Fujio that their father, Monson, is sick and that they should return home to visit him. This trip back will also allow Taison to put some closure on his past regarding his friend Naoto & his ex, Haruka.

Kuroi Misa, a girl with Satanic powers, mysteriously appears in various high schools. Carrying a dagger and a heavy leather bag, she uses her powers to eliminate the evil forces that thrive on deadly sins of the human race. Her ultimate aim is to cleanse the earth and rebuild her broken family.