That Man is the 14th Day of the Days manga series.
Characters In Order Of Appearance 
Edit
Characters in bold denotes the character's first proper appearance.- Katsutoshi Nakazawa
- Tetsuya Nitobe
- Hiroyuki Kurusu
- Naoki Shiratori
- Susumu Inohara (flashback)
- Jin Kazama (flashback)
- Chikako Ubukata
- Tsukushi Tsukamoto
- Junpei Kasahara (vidéo)
- Kaoru Indou
