The members of Peek a Boo meet up at Miyakojima to go deep-sea diving. Iori, who never finished his exam due to sickness, is forced to stay in shallower waters while being teased about it by Kohei. As the licensed group goes diving, Chisa decides to stay on the boat to comfort Iori, who turns out to be suffering from seasickness. He then tells Chisa that despite missing the license, he had fun diving and would love to come back again...