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...

While visiting a store in Landosol, Yuuki and Kokkoro encounter Aoi wearing an unfamiliar uniform. It turns out that Aoi is a new student at the prestigious St. Theresa's Academy for Girls, but is worried she won't be able to fit in. Thus Yuuki and Kokkoro head to the school with her as moral support.

Having journeyed to Monster Isle, the Gourmet Guild runs into Kasumi and Makoto, who are there with their fellow Caon members to investigate a series of recent Shadow appearances. Armed with an extensive knowledge of Shadows thanks to their previous battles, the Gourmet Guild members decide to help with Caon's investigation...

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.

Recently, a mysterious knight has been appearing around Landosol and harming the residents. Inspired by Pecorine, who is angry that the people won't be able to enjoy their delicious food, the Gourmet Guild takes on a quest to defeat the culprit. Along the way, they meet a small girl who calls herself a soldier.

On their way back from farming rice, Yuuki and company find a girl lying on the roadside, who turns out to be Chika, a member of Carmina. As they tend to her, they call over her fellow guild member Nozomi for help. But when Chika finally wakes up, she seems to be acting rather odd...

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...

Pecorine and company visit a crowded festival in the Landosol shopping district, where they enjoy their time sampling the various food stalls and playing shooting games. Labyrista looks on with kind eyes from Labyrinth's crepe shop, overcome with a certain feeling...

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...

Pecorine finally confronts the Omniscient Kaiser, joining forces with Kokkoro and Yuuki, who come to aid her in the fight. Karyl finds herself torn between her loyalty to the Kaiser and her bonds with the Gourmet Guild members. As their feelings clash, the battle enters its final phase. Yuuki, Pecorine, Karyl, and Kokkoro—what future will the Gourmet Guild choose...?