Yumi (ユミ) is an overweight student who is questioned alongside Masatoshi regarding the "Paint-Man" incident. She dates him until the Sket Dan mention that he targets unintelligent, easy-to-charm girls, after which she breaks up with him.
Spoiler
She later becomes the bass player for Yabasawa's Kaimei Rock Festival band, but falls sick along with the rest of the band members.
Manga Debut: Chapter 1 (Paint-Mask) Anime Debut: Episode 1 (The Campus SKET)
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