One day, high school student Masaki is camping in the woods with his friends Ai and Yuki. While exploring, they stumble upon a strange cave, and wind up releasing the seal on an ancient demon lord. The demon lord curses Ai and Yuki, causing them to transform into animals, and escapes to wreak havoc and release yōkai into the city. With the help of the demon hunter Genji, Masaki and his friends must stop the demon lord and lift the curse on the girls.

One day, high school student Masaki is camping in the woods with his friends Ai and Yuki. While exploring, they stumble upon a strange cave, and wind up releasing the seal on an ancient demon lord. The demon lord curses Ai and Yuki, causing them to transform into animals, and escapes to wreak havoc and release yōkai into the city. With the help of the demon hunter Genji, Masaki and his friends must stop the demon lord and lift the curse on the girls.