An unemployed man learns that his ex-girlfriend was murdered. He suddenly finds himself travelling through time to his middle school years and has chance to change the future and save the girl. He aims to rise to the top of the most brutal delinquent gang.

The first-person protagonist is a 27-year-old freelance writer who returns to her hometown from Tokyo, and she gets together with high school friend Satsuki and cameraman Suga to see Shiina, who they all admired in high school. Along the way, vivid memories from high school replay in the protagonist's mind.

A high school student living in Ota City, Gunma Prefecture, has a Filipino mother who works at a Filipina hostess bar.

Kou, who had been living a dull life with no hope for the future, meets the charismatic Hee Bro. and regains the sparkle in his life. When Hee Bro. suddenly dies, Kou tries to find the definition of goodbye.

Aoi Nishimori and Shūsei Kugayama are in love and they begin to live together secretly. Suddenly, Shūsei's cousin, Reon Kugayama, comes to them. Their secret is discovered by Reon. Now, Aoi, Shūsei, and Reon begin to live together.

What was once a superlative varsity baseball coach is now a jaded middle-aged man. He and a former student meet and the older man discovers that his now married pupil is afflicted with terminal cancer. Full of regrets of how he once treated the student the man ponders how to make it up to the man whom he once coached