Quick answer — Ryuuji Takagi worked on Prison School: Mad Wax (Theme Song Composition), Magical Witch Punie-Chan (Music), Nurse Witch Komugi (Music) and 3 more anime.
Ryuuji Takagi worked on Prison School: Mad Wax (Theme Song Composition), Magical Witch Punie-Chan (Music), Nurse Witch Komugi (Music), Bludgeoning Angel Dokuro-chan 2 (Theme Song Arrangement), Mayoi Neko Overrun! (Music), Kemeko DX (Music).
