Tensei Kizoku no Isekai Boukenroku: Jichou wo Shiranai Kamigami no Shito EP4 - Debut in the Royal Capital

Cain visits the church, where the gods tell him there's no entertainment in this world and ask him to invent some. Then Cain runs into Parma, an old friend who's training at her uncle's shop. So Cain asks Parma's uncle to help him create a certain item...