Isekai Quartet season 2

Once the door opens, the students meet Naofumi Iwatani, who watches their faces briefly before he closes it and leaves. Roswaal explains that Naofumi will be transferred to Class 1, while the transfer student for Class 2 is actually Chomusuke, and has the others rearrange their seats by a lottery. Naofumi keeps roaming around the school until he meets Wilhelm and explains to him that he was fighting a monster alongside his companions Raphtalia and Filo when he suddenly was transferred to the school and is searching for them since then. Meanwhile, Kazuma and Ainz meet Raphtalia, who is also looking for Naofumi while Subaru and Aura find Filo with the other pets and start riding her. With the other students playing baseball together, Raphtalia eventually reunites with Filo and just when the two are about to be hit by a stray ball from Mare, Naofumi arrives and uses his shield to protect them. With the three reunited, Naofumi, Raphtalia, and Filo decide to stay at the school with the others until they find a way back to their own world.

Kazuma Satou, Vooren Grantz, Wilibald Koenig, and Rhiner Neumann are all reminiscing about "red stuff". After hearing that there might be some in the Principal's Office, the group decide to head there after class and try their luck, but are suddenly joined by Aqua who has terrible luck. Inside the Principal's Office, Aqua grabs a bottle of the "red stuff" and unwittingly sets off a security system, forcing the group to disarm the traps. After they disarm the traps, the system then summons four giant toads from the Konosuba world. With five people in the heist group, Tanya's comrades sacrifice themselves to save Aqua, but Kazuma uses his stealth skill and the last toad chases Aqua through the hallway. Kazuma grabs the bottle of "red stuff" just as Roswaal appears, giving everyone in the group detention.

Kazuma, Aqua, and the three members of Tanya's unit involved in the heist undergo a hellish detention with demonic bugs entering their bodies. Emilia asks if there is a way to end their detention faster, and hears that they might be able to get out if they perform a "good deed." Later, in science class, Megumin creates a miniature explosion with her classmates' help, blowing up the water pipes and flooding part of the school. The detention group uses their magic powers to divert the flood away from the Principal and the school, earning his favor and getting themselves out of detention early.

Class 2 will have an SAT-style test, so everybody has study sessions. During the test, Ainz is nervous because he was a slacker in school, so he tries to cheat by freezing time so he can copy answers. He is shocked when Aqua, Tanya, and Subaru are still able to move in frozen time. The three wander the room wondering what is going on because Ainz pretends to also be frozen. When the time freeze ends, everybody is able to quickly return to their seats except for Aqua, whom Roswaal accuses of cheating and fails. Ainz, after solving only the simple questions, discovers that the right answer bubbles form the image of Pandora's Actor's (who made the test) head. He completes the head and gets 100%.

It is Valentine's Day and the students who haven't heard of it are informed of the tradition of giving chocolates to loved ones. Petelgeuse Romanee-Conti breaks into the school and decides to help Albedo make chocolates for Ainz until he is caught and kicked out for trespassing. Weiss simply wants chocolate (having not eaten it in years due to the war in his world) and believes Kazuma's lie that a man can simply demand chocolates from girls. Trying it results in the girls beating Weiss up. The students give chocolates to their loved ones, but Ainz laments that his skeletal lich body renders him physically incapable of eating (In the English dub, he is allergic to chocolates).

Ainz, Tanya, and Subaru argue on the best topping for fried chicken: Ainz prefers ketchup, Tanya prefers salt and pepper, and Subaru prefers mayonnaise. Their classmates take sides and are unable to settle it by voting, so Rerugen tells them to settle it in a three-way game of dodgeball. To even out the teams, Rerugen orders Naofumi, Raphtalia, and Filo to participate. The highly destructive game ends in a draw when the ball bursts. The students agree their argument was foolish and make up, but then start arguing on the best topping for croquettes.

It is time for the school physical examination day. Rem and Shalltear are asked to help examine the girls in the nurse's office while Naofumi is asked to help examine the boys in the gym. Albedo and Shalltear try to sneak away and see Ainz naked, but Rem stops them. Kazuma decides to sneak away and see the girls naked, but by the time he does, their examination is already finished. Megumin boasts about how Pandora's Actor complemented her looks as fitting Ainz's aesthetic, causing Albedo to be jealous. Ram becomes upset because Pandora's Actor had been complementing several girls' looks but ignored her.

The students find out Viktoriya is working multiple part-time jobs after school. They confront her and she explains she is trying to earn enough money to buy the special menu in the cafeteria, which costs 30,000 yen. Intrigued, the other students take part-time jobs as well. Viktoriya eventually earns enough and buys the special menu, but the food looks completely ordinary except for its sheer volume. As Viktoriya happily eats it, the disappointed students decide not to buy it. In the final scene, Destroyer reactivates.

Class 1 will do a school play, so they ask Filo to decide on a theme. She wanders around asking people for suggestions; Ainz's followers suggest a play about Ainz. Meanwhile, Tanya trains Megumin to improve her explosion magic; Tanya teaches her how to blow up a single target without massive collateral damage, but cannot convince her to use a shorter incantation. Mare and Beatrice give Filo a book of fairy tales, but she doesn't know how to read, so she decides to find Naofumi so he can read it to her. Lupusregina gives her outrageous suggestions and gets beaten up by Yuri and Narberal for it, but when Narberal insults Tanya's men, Lupusregina then suggests The Ugly Duckling. After Naofumi reads the story to her, Filo chooses The Ugly Duckling for the play. Naofumi praises Filo, making Raphtalia jealous.

Roswaal tells Class 2 that a school festival is coming up and they have to set up a food stand and a school play, promising a reward if they do well, but Ainz points out he didn't keep his promise during field day. Weiss and Viktoriya set up the food stand and Weiss is happy to finally have chocolate. Class 2 chooses Cinderella for the play. They draw lots to decide Ram will play Cinderella, Rem will play the Prince, Aqua will play the Fairy Godmother, Shalltear will play the stepmother, Darkness and Demiurge will play the stepsisters, and Ainz, Tanya, Kazuma, and Subaru will play the horses pulling the pumpkin carriage, which infuriates Shalltear who wanted Ainz to play the Prince and herself to play Cinderella. Naofumi is annoyed that he has to play the Ugly Duckling himself. Hamsuke and Death Knight report to the teachers that Destroyer has broken out from where it was buried. The students find an arch they built has been destroyed and Aqua laments that they can't fix it in time for the festival, but Rem assures her they can if they work together. The teachers discuss that regardless of the danger, they will continue testing the students.

As the school festival begins, Seiya Ryuguin and Ristarte from Cautious Hero: The Hero Is Overpowered but Overly Cautious arrive, but the overly cautious Seiya refuses to enter the unfamiliar school and leaves to Ristarte's chagrin. For Class 3's play, Yunyun performs The Little Match Girl all by herself. Destroyer attacks the school, but Roswaal refuses to let Classes 1 and 2 fight it until their plays are done. Emilia, Puck, Albedo, Aqua, and Viktoriya volunteer to fight it, then Naofumi gives Raphtalia and Filo permission to fight it as well. Kazuma asks Megumin to take Aqua's place as the Fairy Godmother, but she refuses until Ainz and Tanya goad her into it. The volunteers make their stand against Destroyer.

The Cinderella play hits a few snags because Ram, Darkness, and Megumin cannot let go of their personality flaws, but the play eventually finishes. Aqua creates a flood that Emilia and Puck freezes to immobilize Destroyer, allowing Albedo, Viktoriya, and Filo to heavily damage it. To Aqua's surprise, Destroyer displays some new techniques like missiles from its legs and laser eye beams. Albedo and Viktoriya try to block the lasers with a barrier, but start to get overwhelmed until Raphtalia steps in to absorb them with her sword. Aqua finishes off Destroyer with her God Blow attack. The next day, Class 2 is irritated that they did not get any reward, but Roswaal tells them they can only change the future if they truly come together. The class asks what he means, but he tells them class is in session.