You heard that right: characters from a fifth Isekai join the already huge ensemble cast of Isekat Quartet. The first of them, Iwatani Naofumi AKA Shield Hero, is introduced immediately when he peeks into the class where all the other MCs are. He’s not transferring to their class, however: their only transfer student seems to be Megumin’s familiar, Chomusuke…who unlike Puck, has “student” status.
Raphtalia suddenly encounters Kazuma and Ainz Ooal Gown in the hallway and immediately assumes the latter is a monster that needs to be defeated, but Kazuma calms her down and they join her search for Naofumi. Filo, meanwhile, ends up in the pet area with Hamusuke and Death Knight. Raphtalia and Filo are reunited with the Shield Hero when he protects them from a particularly hard-hit baseball from the bat staff of Mare.
That’s pretty much it! The episode’s only eleven minutes, after all. Naofumi decides that while he’s not 100% sure what’s going on, he and his party will try to settle into a school life of following the rules along with the others who have been teleported. It will be interesting to see if he befriends the other lads from Japan…and here’s hoping Melty, Malty, or others from his world show up at some point!