Senpai, Would You Like to Try Cheating with Me? ~Since My Childhood Friend Stole My Girlfriend, I Want to Steal Back My Ex-Best Friend’s Sister~

High school student Naeki Toshiya accidentally witnesses his girlfriend Tsukimiya Airi and his classmate and best friend Nakajo Shintaro coming out of a love hotel together.
Toshiya can’t hide his shock at being cheated on.
At that moment, a junior girl named Rinka, who is also Shintaro’s sister, appears before Toshiya.
“Senpai, would you like to try cheating with me?”
What she proposes is a revenge plan to get back at them by cheating and inflicting the same pain.
Though Toshiya initially refuses, he can’t resist Rinka’s persistent persuasion, and eventually they become entangled in a relationship so deep there’s no turning back…
A forbidden “NTR revenge” romantic comedy between the guy whose girlfriend was stolen and a yandere junior beauty begins here!