Because members of the same bloodline become sexually aroused in the presence of another member of the same bloodline, the Sagemiya family is cursed. Sagemiya This repulses Misaki and her elder twin, Shun, who have pledged to defy the blood call. Shun, on the other hand, loses his cool and turns to their older sister, Kagu, for assistance. After realizing the truth, Misaki loses control and seeks out Shun.