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...

Harima continues submitting his love-fueled manga to publishers, with himself and Tenma as the leads. On his way home, he spots Eri—and panics at the thought of her discovering his secret hobby. As Harima flees, he's intercepted by Mikoto, who invites him to a café. But when Eri walks in and sees them together... misunderstandings explode like fireworks.