These are the stories from before Aki and Riko met. Each side story is narrated by different character.
Takeru Satoh
Aki Ogasawara
2 episodes
Shohei Miura
Shun Sakaguchi
1 episode
Masataka Kubota
Shinya Shinohara
1 episode
Mitsuki Tanimura
Miwako Nagahama
1 episode
Takashi Sorimachi
Soichiro Takagi
1 episode
Kouki Mizuta
Kaoru Ohno
1 episode
Kodai Asaka
Teppei Yazaki
1 episode
Ryo Yoshizawa
Yuichi Kimijima
1 episode
Yuki Morinaga
Sota Yamazaki
1 episode