Monster Musume no Iru Nichijou OVA

During a physical exam, Miia, Centorea, and Mero discover that they have gained too much weight due to Kimihito Kurusu's delicious cooking. To remedy this, Polt offers them first use of her new pool and gym facility before its grand opening. However, it's not all fun and games, as the three girls' competitive spirits start to flare up!