This manga celebrates the 15th anniversary of Nisio Isin's writing career! Koyomi Araragi is an ordinary student in 240 Academy (where “240” is pronounced “Nishio” in reference to Nisio's name). But one day he's tossed into the 240th class, nicknamed “Class Red of the Brink” for all its eccentric students! These are the tales of Araragi's hilarious new hardships in a class full of characters from Nisio's previous works.