Shimada Hibiki is a 17-year-old student who has never been in love. Kosaku Ito is her 26-year-old teacher, who is well known to be a stern and cold person. Hibiki, rescued by Ito after a minor incident, starts to develop feelings for him.

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