Kakeochi High School Teacher

Chieri, a female teacher, secretly romanced with a student called "Shinji." They were a platonic relationship where they "don't do anything until they graduate," but the breakup suddenly came. Chieri was the woman Shinji's older brother, Shinichi, chose to marry him. Shinji understands something and approaches Chieri, but Chieri doesn't say anything... And as months pass, Chieri loses her smile as she continues to move on. And, unable to see Chieri, Shinji makes a "decision"...