A transfer student arrives on campus, and the three members of the SKET-dan introduce themselves, hoping the new student will join, but he politely declines. He returns soon after, covered in red paint as the apparent victim of bullying, asking the group for help. After investigating, they discover the culprit is actually the transfer student himself, who was operating under duress from the school bully and childhood acquaintance. After setting things straight, the new student is able to fit in comfortably at the school, and the members of SKET-dan look forward to their next task.
Yuuki Reiko, member of the Occult Club, barges into the Sket-dan's room holding a picture of one of Kaimei Academy's seven mysteries, the "Ghost of the Incinerator". The Sket-dan are on the case (mainly Switch), trying to find out the truth behind the picture, and getting Shimada Takako from the Newspaper Club mixed up in it, too...
The Sket-dan is having fun trying to take their minds off the upcoming midterms, when they hear rumors of a mysterious DVD that will curse you with bad luck if you watch it. Just then, Kuramoto Ayumi comes in with a simple request, to help cheer up her friend who has been acting strange lately. But there's more to this than meets the eye, as the stoic Yagi is acting like someone who has seen something they shouldn't have...
Uchida Takaaki comes to the Sket Dance with a simple request: make him popular! Bossun and company immediately set their sights on getting Uchida to win a Mr. Popularity contest in their class, but Uchida's shy personality makes it difficult for him to stand out. Can Sket-dan Productions mold him into a star in just one week?!
Bossun may have a way with words, but these clients were born with their feet in their mouths! First is J-son-sensei, the shop teacher with the glass heart and looks straight out of some horror movie! Can the Sket-dan help him find love? A man of few words and many offstandish poses, "Dante" perhaps poses the greatest riddle of all... Can the Sket-dan help this Fallen Angel find his Wings
Yamanobe-sensei is back, and now he's trying to get everyone in the Sket-dan to play a nutty board game called Hyperion. Everyone except for Himeko, as only men can appreciate this game, supposedly. But the epicness gets Bossun and Switch very enthused about the game, and soon they find themselves heading to the world tournament...
A writer for a local newspaper is coming to interview and take a photo of the Sket-dan, and Himeko demands that Bossun get his hair cut. But when Bossun refuses, Himeko takes things into her own hands... What could possibly go wrong? Afterwards, it's the principal's birthday, and the Student Council is planning a surprise party for him. But when the President makes a mess of his prized bronze bust, the principal will be in for a whole different kind of surprise...
Bossun bumps into Himeko outside on the weekend, and they happen to spot Switch and Yuuki meeting up nearby as well. Their curiosity piqued, they decide to trail the 'odd couple' into a shopping mall. Turns out Switch is helping Yuuki with a request- to choose and purchase a laptop, so she can create a website dedicated to her passion of all things occult. Hijinks ensue, with the embodiment of 'Otaku' and 'Occult' clashing their interests and respective positions(supernatural vs science) against each other all the way(in their usual fashion). Nonetheless, they seem to be getting along well(again, in their own way), and even Bossun and Himeko note how unusual it is for Switch to be going out of his way to help his 'archrival', Yuuki. Switch and Yuuki then bump into her old crush from middle school, Kobayashi, who was there with another girl. He talks down to Yuuki, which seems to rub Switch the wrong way. After he leaves, Yuuki confides to Switch her past in her middle school: she was melancholic and had few friends, but wanted to try falling in love. She started having feelings for Kobayashi who was rather popular with the girls, but he turned her down citing her scary appearance. After hearing the story, Switch decides to bring her around the mall to do a total makeover for her. Later, after being abandoned by the girl he was with, Kobayashi spots a beautiful girl standing alone by a fountain outside, and hits on her. This turns out to be post-makeover Yuuki, however, and together with Switch, she finally turns the tables on him. On the way home, they bond over the incident, with Switch still denying any romantic interest in her. However, she notes, he will go with her again the next day to shop for the laptop. At the end of the episode is an omake bit, "Resort Dance", which has the girls at the beach playing the Japanese word game Shiritori.
The principal adores his grandson very much and asks the Sket-dan to prepare a picture play to entertain him. They decide to base the story off of Momotaro, but change things up from the usual... Afterwards, he asks them to play with his grandson for an afternoon, but the kid doesn't seem interested in having fun at all.
Momoka comes to the Sket-dan to ask for help in her voice acting job. In an upcoming episode, she needs to play Liberty Maji back when she was little, and Momoka is having a hard time grasping the mindset of a child for her acting. The Sket-dan try to help by playing children's games with her, but it isn't until she and Himeko accidentally drink one of Chuu-san's drugs that they can really experience their childhood all over again!
In the second Arc finale, Switch's "origin story" continues as Sawa-chan goes to young Switch and his older brother for help from a stalker. In a moment of spite stemming from jealousy, though, Kazuyoshi sends Switch and Sawa off on their own to buy personal protection items. While they're gone, Sawa's friend Yukino warns Kazuyoshi that the stalker is also a slasher. Kazuyoshi means to go out after his little brother and the girl he loves, but fate intervenes...
The Sket-dan get a new assistant homeroom teacher (who wants everyone to call her, Onee-san), but she's a klutz and is upset she can't be a good role model for the students, so the Sket-dan ask Chuu-san to help with some of his strange drugs. Later, Switch goes through some old inventions of his that didn't work out as intended...
Shinzou asks the Sket-dan for help with a makeover to make a good impression when he meets Megumi-dono, a friend he made online, in person. But is shinzou in modern clothes even him anymore? Can Shinzou somehow rectify his samurai beliefs with modern garb? Later, Himeko tries a new workout video, but it doesn't "work out"....
In the third Arc finale, Hime goes to a high school far away to escape her violent past, but the rumors of "Onihime" have spread like wildfire. When a newfound friend gets into trouble with small-time Yakuza hoods, will Hime step in at the risk of exposing her old identity? Also: the secret origin of Sket Dance!
Momoka is the lead actress of a stage play, but she's having trouble with the bland script. Can the Sket-dan teach her how to spice it up?! And then another Sket friend has a success story: Roman, who's just made her manga debut! She shows her story to the Sket members, but will Himeko be able to keep from trashing it?!
On Bossun's 15 birthday, he finds out the truth about his parents. Unable to cope with the tragedy, he lashes out, only to meet the child his father once saved when he was a kid, all grown up, who gives him a mysterious letter his father wrote addressed to his real mother, and one addressed to him...
Countries from around the world gather together once every four years to celebrate the most ancient of traditions, the pinnacle of sports! Testing their own passion and training against the best the world has to offer, the Sket-dan goes forth, with the pride of their country on the line! Will the goddess of victory shine down on our heroes? Will they be able to claim that yes, they are the winners of the Genesis World Grand Prix?
After a bit of horsing around, Himeko accidentally breaks Bossun's fingers and wrist. To pay him back Bossun makes Himeko sign a contract making her his servant! But having Himeko as a maid isn't all it's cracked up to be. Meanwhile, Jin is back trying to woo Himeko, but when he comes to observe the Sket-dan's activities, all he can see is a loving, bickering couple.
Fumi-chan is a great artist, but what will happen when she tries to emulate Roman's style of manga?! And speaking of emulate, when Tsubaki temporarily loses his vision, the Sket-dan plays a prank on him by pretending to be the other members of Student Council... but then they're stuck in the situation!
The students of Kaimei High are going on a class trip, but first, they have to participate in a rope skipping competition to see which class gets the best rooms. Saaya doesn't have an athletic bone in her body, so is worried she's going to doom her class to the worst rooms of all, until the Sket-dan tries teaching her how to skip! Then, the students are on their way, but in the back of one bus, Chuu-sensei is playing mad scientist again, and this time his victims are Bossun, Himeko, and Tsubaki!
Kagerou, a ninja-like purse and wallet-snatching thief, plagues the students of Kaimei Academy. Can the Sket-dan stop him or will it take a ninja to catch a ninja? Over at the Student Council, President Tsubaki is trying to get used to his position, a task made harder when it appears the new treasurer is off her rocker.
Sasuke accidentally broke Bossun's bonus toy car that he won from a candy box. Mimori says her father is collecting something similar so she brings Bossun, Himeko and Sasuke to her home... no, it's a mansion! Wait no, it's a town... Later, after deciding to stop her high speed 'Captain Munch', Chiaki is challenged by an old foe to a rematch over her 'food fighter' abilities, can she regain her 'Munch' or while Bossun be able to fill in?
When class 2-D's Shuuichi Morita loses control, Kiri's action makes him throw the chair towards Mimori. Sasuke tells Kiri to cooperate, but Kiri refuses to follow Sasuke's orders. Later, Himeko hangs out with Kiri who shares his story about Kihara who was a victim of Kutsuwa, a teacher from his old middle school. When Kiri's old teacher comes back to Kaimei High School and bullies Himeko, Kiri Kato loses his composure. Can Bossun and the gang stop Kiri Kato from crossing the line in his quest for justice?
The first story is about Kiri demonstrating his loyalty to Tsubaki, but Tsubaki's student council feels Kiri is acting more of an errand boy. Later, the Sket Dan and the student council help Hani overcome her problem with her distaste of men. At first, Himeko and the girls dress as guys, but it doesn't work. Then, Himeko proposes to have Bossun and the rest of guys to cross dress as girls. Can the Sket Dan crew help Hani overcome her hatred for men?
While Bossun and the Sket Dan are helping the basketball team due to Jogasaki's little accident, Saaya works up the courage to confess to Bossun. Meanwhile, Sojiro thinks Saaya is still in love with Tsubaki. Can Bossun and the gang help the basketball team and what will happened between Saaya and Bossun?