Memories Off Sousou ~Not always true~

Kusumegi Itsuki, a second-year student at Fujikawa High School attached to Keiyo University, has a fiancee whose face and name he does not know. Because of her presence, Itsuki has never been interested in romance. His 17th birthday, when he would find out who his fiancee was, was approaching in about a month. One day, in order to hold a meeting to comfort a classmate who had lost her heart, Itsuki goes to Fujikawa's family restaurant "Russac'', but ends up getting into trouble with a part-time female clerk there. The clerk, Sunomiya Sae, was a third-year senior at the same high school. Alth(Storyline via IGDB)