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.

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...?