OP：ヒリーの店・おばあちゃんのエアギター

Koyama's designs look great in this series.

c1,2: Takashi Tomioka
c3: Yasuyuki Noda
c4,5: Masaaki Tanaka
c6: Nobuyoshi Souzaki
c7,8: Hitoshi Haga (as seen by Quiz's sourceless comment above)
c9: Eiji Abiko
c10,11,12: Yasuo Muroi

the only thing I'm less than certain of is if one or more of Muroi's cuts belongs to Eiji Abiko, but I think it's unlikely.