Kōsuke Edogawa (江戸川 耕助, Edogawa Kōsuke) is the classmate/best friend of Kiyotaka Yoshino in class 2-1 and the younger brother of Shiki Edogawa who is a masochist (a person who derives sexual gratification from their own pain or humiliation).
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- The name Kōsuke means "plowing" (耕助).
- Kōsuke's surname Edogawa means "bay, inlet" (江) (e), "door" (戸) (to/do) and "river, stream" (川) (kawa/gawa).