|Base of Operations||Saint Ishiyama Academy|
|Anime Debut||Episode 26|
|Manga Debut||Chapter 54|
Nakadai (仲代, Nakadai), Mori (森, Mori) and Sumida (角田, Sumida) are the three Saint Ishiyama Academy students who threw weights on and severely injured Takeshi Shiroyama after he sent Yuka Hanazawa and Ryōko Asuka away from them when they attempted to flirt with the girls. It is unknown as to which name each person carries.
The student who threw the first dumbbell at Shiroyama, whose personal name also includes Kamogawa (鴨川, Kamogawa), appears in the manga only.