My Teacher (2017)

Kosaku Ito (Toma Ikuta) teaches world history at a high school. He looks inflexible, but, in fact, he has a warm heart. Hibiki Shimada (Suzu Hirose) is a student and she has a crush on Kosaku. She has never had a boyfriend before. Due to being young and naive, she is honest to Kosaku about her feelings. Kosaku though is unable to express his feelings freely due to his position as a teacher.—AsianWiki