Episode 2, Grand Blue Wiki

Underwater (水の中で, Mizu no Naka de? ) is episode 2 of Grand Blue anime. After a cutthroat battle with Kouhei Imamura, a handsome otaku from school, Iori ends up joining the Peek-a-Boo diving club. Iori arrives home worn out from the day, but perks up when he hears about a party with a women's college. Iori realizes that he hasn't actually slept in his new room yet, but the others in the club are planning a mixer with some women from the local Oumi Women's University. Eager to join the mixer, Iori

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Spoilers] Grand Blue - Episode 2 discussion : r/anime