Quick answer — Keiichirou Oochi worked on My Teen Romantic Comedy SNAFU Climax! (Series Composition), HINAMATSURI (Series Composition), I Made Friends with the Second Prettiest Girl in My Class (Series Composition) and 35 more anime.
Keiichirou Oochi worked on My Teen Romantic Comedy SNAFU Climax! (Series Composition), HINAMATSURI (Series Composition), I Made Friends with the Second Prettiest Girl in My Class (Series Composition), The Quintessential Quintuplets 2 (Series Composition), The Quintessential Quintuplets Specials (Series Composition), The Angel Next Door Spoils Me Rotten (Series Composition), The Demon Girl Next Door Season 2 (Series Composition), The Quintessential Quintuplets Movie (Script) and 30 more.