Her father died suddenly, and the high school girl Tomoshi Kimura (Keiko Yoshimura) moved to the new house booked in the suburbs with her mother Keiko (Chaojiazhen Yumi). Keiko is a capable and independent lawyer, so she takes too much care of her daily life and worries about the safety of going to and from school. Keiko asks her daughter to stop the activities of the track and field department as soon as possible, which makes Chushi feel like a bottle of five flavors. This morning, Chu Shi accidentally met the garbage disposal youth Ryutaro Noguchi (Liu Le Youmi acted the role of). Ryutaro had no parents and grew up in an orphanage. He struggled to walk alone, and the appearance of Chu Shi seemed to give him a different feeling. Two young people from different backgrounds have established a pure friendship, but Keiko's strict tutoring has caused twists and turns and rifts between the two young people. On that night, Ryutaro failed to restrain his inner impulse, and he crossed the line between the two.