The school plans on going on a sea-side trip. Urara Urakata, partner of Sagiri in the Chuuma Ninja Army encourages her to buy a sexy swim-suit and asks to make Kogarashi tag along. She somehow manages to ask Kogarashi to come along with her by lying him that a Youkai has appeared in the swim-suit shop. The three of them enters the shop and the two tries different swim-suit while Kogarashi attentively waits for the Youkai to appear...