Taichi Nekozuka, was raised by his grandfather, who taught him that mercy does not benefit others.

Now that he's a high school student, he spends his days helping those in need.

One day, he noticed a high school student who is about to commit suicide by jumping off the roof of a building, however...
猫塚の“やさしい”彼氏・蛇ノ目には裏がある。
――ぐちゃぐちゃに泣く顔が見たい
そのためだけに好きでもないのに猫塚に近寄った。
未経験の猫塚は、「まずは気持ちいいこと覚えよう」と
気遣う言葉に流されて、過激プレイで開発されていくが……

これは恋なんかじゃない――はずだった
歪んだ性癖から始まる、無自覚すぎる執着愛