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Kenichi is classmate of Rin Eba, he is strongly interested in her. In order to be together with her more often he decided to go to the same cram school as Rin. When he followed her to find out which cram school she attends he became accidential witness of her true nature. Rin made him into "errands slave" and threathened to accuse him as stalker if he dares to disobey or tell anyone about this evil side of her. However he became the person around whom she doesn't have to wear the mask of nice girl.