Naoyuki Kusabe (草部 直幸, Kusabe Naoyuki) is a former student of Kaimei High School and the leader of the defunct group The Spider's Association.

Manga Debut: Chapter 23 (The Spider's Association)
Anime Debut: Episode 5 (The Ghost of the Incinerator)

(source: http://sketdance.wikia.com/wiki/Naoyuki_Kusabe)