Kare no Shiranai Himitsu o Irete

 

Yui and Naoya have been dating for two months, but their relationship is still awkward. Then, a mysterious man calls out—"Yui-chan?"—and her world shatters.

This man was Yui’s first lover—a secret she thought was buried. Before dating Naoya, curiosity led her to lose her virginity to him. Now, he threatens to expose her past, forcing her into a dangerous secret affair behind her boyfriend’s back!