Haruka is a dolphin adopted by Makoto's family into a pod of orcas after being orphaned by a shark attack. The two are inseparable until an unfortunate event brings them worlds apart. Makoto does everything he can to bridge the gap, Rei and Nagisa are so gay for each other, and Rin can't seem to catch a break.

In which Haruka has always wanted to be a mermaid and when he finds his chance he takes it, with his friends' help of course. Hints at Makoto/Haruka and Nagisa/Rei. One shot