Yuma Tonami (十波 由真 Tonami Yuma ) is a close friend of Manaka Komaki.
Yuma has neck-length aqua-blue hair and green eyes and an average height.
Yuma takes on a tsundere personality, especially when she's with Takaaki Kouno, whom she keeps challenging. She doesn't admit it but there are indications that she likes Takaaki.
- The name Yuma means "reason, case" (由) (yu) and "real, genuine" (真) (ma).
- Yuma's surname Tonami means "ten" (十) (to) and "wave" (波) (nami).