Sket Dance

The manga focuses on the misadventures of the "Campus Support Group" or "Sket-Dan", of Kaimei Gakuen, a club devoted to solving any and all problems brought to it by the staff or student body for the general improvement of campus life. Due to its general lack of meaningful assignments and unglamorous 'group of handymen' reputation the organization is treated with widespread contempt and it is composed of only three members.
(Source: Wikipedia)