Adult Reunion NTR: I Never Expected to Be Stolen and Repeatedly Creampied by My Scumbag Ex-Boyfriend at My First Drinking Party Since Turning 20... Kokoro Ayase
Kamejirou lives with his girlfriend, Kokoro. When he finds out she's been invited to her old school's reunion, he grows anxious—she's only 20 and doesn't drink much, so he worries about her being in a drinking environment. Throughout the reunion, he repeatedly tries to contact her, but the line is always busy. The next morning, when Kokoro returns home, Kamejirou confronts her, but she remains silent and refuses to speak. His worry deepens until he catches her bringing a man from the reunion back to their house—their former lover—witnessing the betrayal firsthand, shattering his heart.