In an Anime World, but Able to Connect to Reality

After transmigrating to an anime world with his phone, he seems to discover something strange. This anime world doesn't have nearly as many songs or shows as you'd expect. When Asagi hums A Thousand-Year Promise, the girls insist on dragging him into a band! But Asagi really can't write songs!

A crossover, a stitched-together world. The world of the crying girls, MyGO, Bocchi the Rock (tentative). But he discovers that this world only has the things that appear in anime, and nothing else. There's no music to listen to. No anime to watch, either. How is anyone supposed to survive in such a boring world? Looks like he'll have to bring it all over himself.