A fight breaks out among Tokiwadai Middle School’s three biggest cliques! At first, Mikoto has no interest in the drama, but after meeting with the leaders of each (and running into free-spirited Ruri, who isn’t affiliated with any clique, yet has the interest of all three), she suddenly finds her school life taking a turn!
Begins with a brief wrap up of the characters of the previous story. Then back in time to Misaka's 1st semester at Tokiwadai. Lots of humor. We see the vending machine, Misaka's first roommate, Misaka and Shokuhou rivalry and the start of a new story focused on cliques at Tokiwadai. Lots of fun especially if you have been reading from the beginning.