At the beach, Harima's lost his swim trunks and ends up stuck in the room—completely naked. Just when he thinks things can't get worse, Eri walks in! His vacation is going off the rails... fast.

Mikoto and Imadori are lost at sea and somehow make it to an inn. Meanwhile, Tenma mistakenly thinks Harima is in love with Mikoto and drags him outside to practice a love confession—with her as the stand-in target!

Tenma hosts a study session at her house, but when Mikoto and Akira are late, she and Eri begin without them. In an unexpected moment, Tenma tells Eri that Harima might have feelings for Mikoto. Still flustered from her beachside run-in with Harima, Eri can't hide her reaction...