 If you liked
Grand Blue
|
 ...then you might like
Rikei ga Koi ni Ochita no de Shoumei shitemita.
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Both shows are comedies and take place in college. Grand Blue focuses on diving, whilst RikeKoi focuses on science.
Otaku character found in both shows too. Grand Blue has more slapstick style kind of humour though. The main characters in RikeKoi are also slightly more intelligent.