Natsuki works on the large resort AQUA that covers an entire island. One day, he was put in charge of renewal of the indoor pool area, which was the least popular attraction despite its past popularity. He worked hard with the staff to meet the manager’s expectations, but no matter how hard they tried, they still couldn’t rise up from the bottom. It was at that time when ‘strong’ reinforcements appeared in the form of three nekomimi girls Mikan, Lime and Lemon, who came to live with Natsuki to repay him for his kindness. Will their help be enough to bring the indoor pool area back to its glory days?