Koakuma Kiss

Following her mother's remarriage, the narrator gains a younger brother named Chinatsu. Initially, she believes him to be a perfect sibling due to his angelic smile. However, she soon discovers that he is both perverted and bad-tempered. The realization that her seemingly innocent brother is, in fact, a mischievous troublemaker shocks her. The series includes multiple volumes titled to reflect escalating situations involving their complicated relationship.