Arata Kaizaki, a jobless adult, undergoes an experiment that makes him 10 years younger. He goes back to high school and falls in love with Chizuru Hishiro, who is more than she seems.
At first glance Yukishiro Nanako seems like a normal high school girl, but she has a notable eccentricity: instead of speaking, she communicates only through written senryu poetry! This means she expresses herself only in 5-7-5 syllables. To most this might seem like an inconvenience, but for Nanako and her ex-delinquent bestie, Busujima Eiji, it adds to the experience of their high school lives as they run the Literature Club.
Yoshioka Yuiko begins the first grade in high school. She gets sick with the cold and stays in bed. At that time, she gets a phone call from class president Matsubara. Yuiko becomes flattered by his kind voice on the phone. The next day, she goes to school and meets Matsubara. He is a mysterious boy, wearing a paper bag over his head. Her high school days begin with pounding heart.
