A Dark Rabbit Has Seven Lives

いつか天魔の黒ウサギ

Kurogane Taito has always considered himself painfully average, until an accident shakes loose memories sealed nine years earlier: a childhood contract with the vampire Himea Saito, who put her poison in his blood so that he cannot die unless he is killed seven times within fifteen minutes. With his memory back, Himea breaks out of the dimensional prison she was locked into, and the two are pulled into the schemes circling her around Miyasaka High School. The light novel spun off a manga, an anime, and further series.