Quick answer — Hiroko Moriguchi performed 1 anime theme, including "Hoshi yori Saki ni Mitsukete Ageru" from One Punch Man.
Hiroko Moriguchi performed the anime theme songs "Hoshi yori Saki ni Mitsukete Ageru" (One Punch Man).
Hiroko Moriguchi's first listed anime theme is "Hoshi yori Saki ni Mitsukete Ageru", the ending of One Punch Man.