The pure-hearted protagonist, 'Fuyuzuki Danta,' has long harbored feelings for his childhood friend, 'Inami Rio,' but Rio treats the somewhat unreliable Danta like a younger brother. Nevertheless, Danta summons his courage to confess, and they become a couple. Danta is on top of the world.

However, Rio's body and heart already belonged to their mutual older brother figure, 'Natsukawa Kaito.' Rio cannot resist Kaito's wild, masculine charm. Even her relationship with Danta was at Kaito's behest. Unbeknownst to Danta, the Rio he adored was falling deeper and deeper under Kaito's influence—

Furthermore, 'Momota Naka,' a top student who attends the same prep school as Danta, after learning Rio's secret, also falls prey to Kaito's sweet words and techniques…

A humiliating BSS (I liked her first) hardcore NTR!!