2年前に両親を亡くした渡直人は幼なじみで畑あらしである館花紗月に6年ぶりに再会する。彼女の言動に振り回される渡直人、直人に思いを寄せる石原紫、アルバイト先で再会した中学校時代の後輩・梅澤真輝奈。いびつな、そして狂った崩壊寸前のラブコメが始まる。
Naoto Watari has had his share of struggles: his parents died two years ago, and now he and his sister live at his aunt's house. There, his desire to protect his sister earned him notoriety as "the guy with the sister complex"—which never mattered to him, as his sister always came first. But when Satsuki, a childhood friend-turned-enemy (maybe), becomes his schoolmate, Naoto's ordinary life is thrown into chaos ... and Satsuki may just be the beginning.
