After a failed hunt for the second volume of a grimoire in Jinbocho's bookstore district, Jashin-chan and Yurine enjoys lunch at Jiro. Yurine buys take-out for starving Pekola, who is hesitant to accept since she houses the devil. When Pekola finally decides to eat, Jashin-chan had devoured it all. Minos and Jashin-chan's past and Pekola's job is revealed as super cop Mei makes a comeback.

Yurine confesses that she once wrote "dictator" in a composition about "future me." I want to destroy anything that is against me and create a "Yurine Kingdom" that gathers only those who pledge allegiance. When I found out that Persephone II was thinking, Jashin-chan was shaken by fear and tries to get rid of Yurine. Another day, the group came to swim in the sea with a private beach ticket that was again awarded by Fukudome in the shopping street. And Jashin-chan in the swimsuit had legs again...!?

Jashin-chan decides to change her character for the beginning of the anime's third season. Seeing her new, serious expression seems to influence Yurine and the other characters, as well... Meanwhile, Pekola welcomes the New Year hungry, as usual. She visits Yurine's house after receiving an invitation to eat ozoni, but for some reason, the gang breaks into a karuta game before they start the meal. The game then progresses into a battle between devils, angels, and humans...

As the gang explores Furano, Hokkaido, the weight of Jashin-chan's debt begins to push her and Medusa to the brink of despair...