MARS Gaiden: Namae no Nai Uma

A story set after Rei and Tatsuya begin high school, where Tatsuya initially dislikes Rei due to his affection for Kira and engages in conflicts with him. Following a dramatic motorcycle confrontation between Rei and a group of reckless bikers, Tatsuya and Rei develop a new bond. The story also introduces other key characters from the MARS series, such as Harumi. Two additional chapters are unrelated to MARS: one explores the complex dynamic between Isomu, a man who feigns fearlessness, and Ayame, a girl with unusual behavior. The final chapter focuses on Nina, dealing with family issues, and Rui, a classmate whose interest in a close friend of Nina's may shift toward her.