Quick answer — Wataru Watari worked on My Teen Romantic Comedy SNAFU Climax! (Original Story), My Teen Romantic Comedy SNAFU TOO! (Original Creator), My Teen Romantic Comedy SNAFU (Original Creator) and 12 more anime.
Wataru Watari worked on My Teen Romantic Comedy SNAFU Climax! (Original Story), My Teen Romantic Comedy SNAFU TOO! (Original Creator), My Teen Romantic Comedy SNAFU (Original Creator), My Teen Romantic Comedy SNAFU TOO! OVA (Original Story), Yahari Ore no Seishun Love Come wa Machigatteiru. Kan: Dakara, Shishunki wa Owarazu ni, Seishun wa Tsuzuiteiku. (Original Story), Ron Kamonohashi’s Forbidden Deductions Season 2 (Series Composition), The Magical Revolution of the Reincarnated Princess and the Genius Young Lady (Series Composition), My Teen Romantic Comedy SNAFU OVA (Original Creator) and 7 more.