Eiichi Hiraizumi

The Kaimei High School baseball club's reserve pitcher who is questioned as a potential suspect in the "Glass Man" investigation. He appears to be in a relationship with the club's manager, Sakiko and promised to take her to Kōshien. He has very poor aim and silently practices his pitching every morning despite not being a regular on the team.

Manga Debut: Chapter 69 (The Glass Man)
Anime Debut: Episode 33 (The Glass Man)

(Source: SKET Dance Wikia)