Grand Blue

Synopsis

Iori realizes he hasn't actually slept in his new room yet, but the others in Peek a Boo are planning a mixer with some women from the local Oumi Women's College, so Iori tries to quickly make up his room to convince Nanaka he's responsible enough to go to the mixer. However, Shinji, Ryujiro, and Kohei all "help" decorate his room with lewd posters, creating increasingly awkward scenes when Nanaka and Chisa come to check on him, until Nanaka forces him to sleep in a rundown adjacent room. Later, Shinji and Ryujiro try to get Iori used to being underwater at a local pool to prepare him for deep-sea diving. However, after seeing Ryujiro rip off Kohei's bottom, Iori resolves not to get involved. That night, Nanaka takes Iori to an aquarium at Chisa's request, inspiring him to try out diving.

(Source: Wikipedia)