Butterfly Kiss BladeButterfly Kiss (SHINONOME Taro); バタフライ キス; 蝶吻之刃; 버터 플라이 키스

Homura Tsukishima and Sakurako Hirosue are roommates at Principia Academy, a school located on an island created specifically for researching "shiki", which is a form of power created by manipulating numbers.