Kakinuma (柿沼?) was Tomoko's second-year classmate in high school. He sat next to her but never had a conversation with her. He is currently a third-year student. It is revealed that he hangs out with other otaku boys who game with Shiki Futaki.
Kakinuma is shown to be somewhat awkward and nerdy, never really standing out much.
Kakinuma has a bowl hairstyle and wears rectangular framed glasses.
- Volume 8: Chapters 67, 68, 69
- Volume 9: Chapters 82, 88
- Volume 10: Chapter 95
- Volume 11: Chapters 99, 105,
- Volume 14: Chapter Special Edition
- Volume 20: Chapter 188
- TBA: Chapters 199-2
Strikethrough episodes or chapters indicate the character was mentioned but did not make a physical appearance)
Kakinuma is usually shown to be with a couple of other nerds playing video games. None of the others have been named, and not much is known about them or their relationship. It is revealed in Chapter 188 that they accompany Shiki to the arcade. Koharu, observing them, notice that they seem to take a particular interest in Shiki when she dances the dance challenge game.
As noted, he and his friends game with her. Currently nothing more is known about their relationship.
- The surname Kakinuma means "persimmon" (柿) (kaki) and "swamp, pond, bog, lake" (沼) (numa).
- Persimmon is an edible fruit that resembles a large tomato and has very sweet flesh.
- While there is a Tomoya Kakinuma playing catcher for the Chiba Lotte Marines, he started playing 2017.
|Female Characters||Tomoko Kuroki | Shiki Futaki | Anna Haruna | Shizuku Hirasawa | Akari Iguchi | Hikari Itō | Megumi Imae | Asuka Katō | Kayo | Kotomi Komiyama | Mrs. Kuroki | Sachi Mima | Koharu Minami | Miyazaki | Miho Narita | Yū Naruse | Hina Nemoto | Ogino | Nagi Ōtonari | Akane Okada | Reina | Fūka Sasaki | Kiko Satozaki | Sayaka | Yuri Tamura | Mako Tanaka | Emiri Uchi | Masaki Yoshida|
|Male Characters||Tomoki Kuroki | Aomatsu | Art Teacher | Hatsushiba | Homeroom Teacher | Jun Ishimine | Kakinuma | Yoshinori Kiyota | Kosaka | Mr. Kuroki | Suzuki | Nico Tanigawa | Wada | Yocchan|
|Minor and Unnamed||Minor and Unnamed Recurring Characters|
|Manga Volumes||1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22|
|Anime Episodes||1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | OVA|