
Quick answer — Kaworu Watashiya worked on Tsugumomo (Endcard), Kodomo no Jikan: Ni Gakki (Original Creator), Kodomo no Jikan OVA (Original Creator) and 1 more anime.
Kaworu Watashiya worked on Tsugumomo (Endcard), Kodomo no Jikan: Ni Gakki (Original Creator), Kodomo no Jikan OVA (Original Creator), Kodomo no Jikan (Original Creator).