Uncle & Niece ~A Tale of Love & Classmates~

The girl in my class whom I fell in love with was in love with someone else. However, that someone else was a member of her own family. A trivial encounter leads the protagonist to develop feelings for a girl in his class. While having become aware of his love for her, he cannot muster up the courage to confess and ends up remaining friends with the girl. However, one day he witnesses her together with an older man.

Official Translations:
English, S.Chinese, T.Chinese