Jashin-chan, a devil from Hell was abruptly summoned to the human world by Yurine Hanazono, a stoic college student who lives in a run-down apartment in Jinbocho. They're forced to become roommates since Yurine doesn't know how to send Jashin-chan back. But according to Jashin-chan, she could return by killing Yurine, so she takes action...?! A viperous roomie comedy that keeps you on your toes!
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...
Now that Pino has been run out of Heaven, she fears that someone will be coming from there at any time to eliminate her. She heads to the park, where she hears Yurine's angry voice. Startled, Pino looks over to see Yurine's fist flying toward Jashin-chan... but striking a little girl instead. Yurine panics when she realizes what she's done, but the child seems unfazed. Pino then realizes that the child is Lierre, the God of Heaven, on a visit to the human realm.
The many sides of Jashin-chan are holding a meeting within Jashin-chan's head. It seems one of the attendees believes that Jashin-chan is incapable of ever beating Yurine, and the "original" is intent on rooting out the traitor, but they all begin to suspect each other and an argument ensues. Later, Yurine and Jashin-chan come across a Jizo statue by the roadside, and Jashin-chan eats the mikan that someone left there as an offering. Yurine warns her that she may incur karma's wrath for stealing an offering to a god, but Jashin-chan doesn't listen...
Jashin-chan is helping Pino for once, by raking up fallen leaves. Once she has swept them into a sizable pile, she smiles suspiciously as she looks at them, seeming to formulate a plan... Days later, Jashin-chan is walking down the street, visibly frustrated, when a great idea hits her! She hides in Yurine's room disguised as a statue while Yurine is away from home. But when Yurine returns home and actually doesn't seem to notice the statue's true identity, Jashin-chan is so surprised that she loses sight of her plan...
Jashin-chan is excited to learn that her beloved childhood teacher, Persephone, is coming to visit.
When Jashin-chan runs away to escape debt collectors, the gang heads to Kushiro, Hokkaido, to find her.
Jashin-chan's flight from debt collectors takes her to Obihiro, Hokkaido, where she continues trying to make a quick fortune.
Jashin-chan continues to flee from debt collectors, this time ending up in the southern coastal town of Minamishimabara.
As the gang explores Furano, Hokkaido, the weight of Jashin-chan's debt begins to push her and Medusa to the brink of despair...
Jashin-chan comes home to find Yurine gone, and begins to wonder if she's finally abandoned her.
Jashin-chan recalls all the naughty things she did as a child, and decides to donate blood to make up for them.
Princess Ecute of the vampires tries to get Yurine to join the vampire clan, and Jashin-chan is determined to stop her.
