Mika calls Yüto late at night to invite him to Haruka's upcoming birthday party. Yüto goes to Akihabara to buy a gift and bumps into Nobunaga, who helps him in choosing the gift. After buying the gift, Yüto comes home where Hazuki and Nanami take him, along with Ruko and Yukari, to the party venue, a remote island. There, Yüto meets up with Mika and Haruka. While enjoying themselves on the beach, Yüto meets an old man and helps him search for his special fish hook...