Knight

Ashinaka High School is known for its unique setting: the entire campus is built on an island. Yashiro Isana, aka Shiro, is having lunch with a cat on one of the school rooftops. Shiro goes on an errand for his classmate Kukuri but on the way he gets chased by several men. He was the saved by Kuro Yatogami who claims that he wants to put an end to all evil.