Pecorine wanders the streets of Landosol, snacking on tasty treats as she goes. Meanwhile, a starving Yuuki, Kokkoro, and Karyl arrive at a restaurant and attempt to place an order, but Pecorine has already devoured the establishment's entire stock of food. However, it just so happens the restaurant has a forbidden secret menu!

Pecorine and Karyl, together with the Gourmet Guild's founders, Kokkoro and Yuuki, are able to secure a base of operations called a "guildhouse" from the Guild Association. Thrilled to begin their guild activities, they arrive at their new guildhouse only to find that it has been left abandoned for many years. Undeterred, the group sets to work tidying up.

After successfully adapting to life in the guildhouse, Yuuki comes down with a terrible cold. Despite Kokkoro, Karyl, and Pecorine's best efforts to nurse him back to health, his condition refuses to improve - in fact, it gets even worse. With no other option, they take Yuuki to a nearby clinic, only to have a shocking experience.

Yuuki and Kokkoro visit their familiar haunt, the Cockatrice's Nest, to drop off a souvenir. However, they arrive to find the owner frantically making pudding, as though he's been possessed. Just then, a diviner named Shinobu arrives on the scene.

One day, Yuuki heads out to deliver an item to a client. When Pecorine and the others meet up with him, they discover that the client is Tsumugi, a member of the popular idol group Carmina, and Yuuki is being made to wear a cute outfit at her behest. The group is naturally confused, but there seems to be a reason behind it...

The Shadows on Monster Isle form a swarm with the golems and launch an attack on the islanders. Meanwhile Pecorine suddenly disappears from sight. While the Caon members, along with Yuuki and the others, are putting up a desperate fight to protect the island, Kasumi comes up with a secret plan to stop the Shadows' progress.

Kokkoro arrives at the post office to send a letter, where she is unfortunate enough to encounter a group of robbers who have broken in. In order to recover their stolen letters, Kokkoro joins forces with two Lucent Academy students named Suzuna and Misaki to pursue the thieves all the way to their hideout...

When an injured Miyako and Shinobu show up at the Gourmet Guild, Pecorine and company are shocked to learn that Diabolos has been attacked, and its members have been kidnapped. As Shinobu explains that the assailant was someone they never would have expected, there is a loud rumbling that shakes all of Landosol...

Pecorine confesses to the people of Landosol that she is the true Princess Eustiana. In order to reclaim her name and throne, she vows to overthrow the imposter princess—the Omniscient Kaiser. However, she must first fight against the captain of Nightmare, Jun, who has been brainwashed...