Life can be difficult in high school. Luckily for Kaimei Gakuen High there is a club called the Sket Dance. Defined as the "Campus Support Group," this club is dedicated to solving the problems of their school. However, due to the lack of important jobs, the Sket Dance is often overlooked and mostly used to do boring handiwork tasks rather than solving actual problems. But when they do get a job, like finding the culprit of bullying or taking care of a classmate's pet monkey, they are able to show their true skills. The Sket Dance has three members: former delinquent and violent Himeko, information and technology-loving otaku Switch, and atypical leader Bossun. Whether it's solving problems or just fixing up the storage shed, the Sket Dance will always try their best and give each job their all!
It is the Edo period, an era when samurai are still of great importance - at least they used to be, until all sorts of aliens called the Amanto decided to take over the government and revolutionize Japan so it wouldn't be so uncivilized. In Edo, now a city where anachronism is the rule rather than the exception, Gintoki, a former samurai, tries to make a living doing odd jobs. During the course of his work, Shinpachi, a would-be samurai; and Kagura, an absurdly strong girl, join him. Of course, he has them work for free, how else would Gintoki be able to buy Shonen Jump and strawberry milk, let alone pay for unimportant things like rent if he has to support someone other than himself?
Both Gintama and Sket Dance are centered around the same idea. A group of three people, which include a violent girl, a nerdy boy, and an atypical useless leader, take on odd jobs and services for the help of other people. You can't get more similar than the same plot structure. If you like one you will like the other.
Apart from the surprisingly similar characters from both series, Sket Dance and Gintama are very similar to each other; although Sket Dance has a possibly more mistery than the more light-hearted and absurd sci-fi setting of Gintama, both manga relate around a group of free-lancers with unique members, such as overtly violent girls, only apparently useless leaders that turn out to actually have quite amazing skills and so on, all with a heavy use of humor and a plot which remains hidden behind the various gags...
Both involve a group of three people trying to help out others. One is the boss who seems like a good-for-nothing but pulls through at the end. The other is an otaku and the last is a girl with fierce strength. Both are comedic and have parodies. They have similar feels.
Ouran High School is a prestigious private academy where money and status count for everything. Haruhi Fujioka is a scholarship student at the elite school, and is appalled by the lazy attitude of the rich and powerful students towards their studies. The Host Club is a clear example of this: a group of six attractive and wealthy boys spend their time entertaining the female pupils for a profit. When Haruhi accidentally breaks a ¥8,000,000 vase belonging to the club, they force her to work off her debt as one of the club's members; and to do so, she must masquerade as a boy! Can Haruhi keep her gender a secret from the club's exclusive clients?
Both manga focus on the development of High School club activities. Oran High School Host Club, and Sket Dance are clubs that exist to help the people of their schools. They both contain small story arcs and rely on recurring supporting cast. They are so similar that it's impossible to read one without being reminded of the other.