Caligula (E10)

The Go-Home-Club members are locked inside the music prep room. The Go-Home-Club president, Shikishima Ritsu, is nowhere to be found. Eventually everyone grows paranoid and begins looking for the culprit. That's when Kensuke proposes that start introducing their true selves. In order to learn more about each other, they begin prying into the darkness within their hearts. (Crunchyroll)