Grand Blue Dreaming. 16

After scoring a winning lottery ticket, Iori convinces Chisa to join him on an island getaway to Okinawa. A jealous Aina resolves to throw a wrench in any potential romance by tagging along in secret... and even ropes Kohei into her scheme! It's two days of botched love hotel bookings, a broken-hearted otaku, and even a little diving in this love duel for the ages!