Masatoshi Kosaka
Masatoshi Kosaka
小坂 正利
Kosaka Masatoshi
Nickname Maakun (マーくん)
Gender Male
Hair Brown
School Kaimei High School, Class 2-?
Manga Debut Chapter 1
Anime Debut Episode 1
The Campus SKET
Seiyū Yūichi Iguchi

Masatoshi Kosaka (小坂 正利, Kosaka Masatoshi) is a student who the Sket Dan question about the "Paint-Man" incident.



Masatoshi Kosaka is known for his silver tongue and tendency to court multiple girls at once.


After the Sket Dan mention this information to his then-girlfriend Yumi, she dumps him and he appears genuinely depressed as a result. He shows up again in chapter 167 still trying unsuccessfully to convince Yumi that he is in love with her.


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