Shintaro, Tsumugi, and their supernatural friends decide to go to the occult research club's summer camp. As it's being hosted at Hisui's family's vacation home, they're treated to lavish service while they enjoy the beach and hot spring.

The occult club decides to end their summer camp with a bang by trying to summon devils and playing with fireworks. When they return home, Towa and Shintaro spend an entire day together out on the town.