Kou Mukami visits Yui Komori in her room and gives her roses as a gift.
Yui expresses her appreciation for the
beautiful roses, but is confused when Kou demands something in return and suddenly changes his behavior. Kou feeds on her blood and Yui blacks out. When she comes to, Kou is gone. The same night, Kou returns from work and asks Yui to help him get changed. Yui goes to his room and discovers multiple scars on Kou's back... ...plus