Boku wa Ashita, Kinou no Kimi to Date suru

Takatoshi Minamiyama majors in art at a university in Kyoto. On the train to the school, he sees Emi Fukuju and falls in love with her at first sight. Gathering up all his courage, he speaks to her. They begin to date and enjoy happy days together, but Emi reveals her secret to him.

(Source: MyDramaList)