Original creator (light novel) : Taro Tatsunoko
Original Character Designer : Yū Amano
Plot summary : The story follows Izayoi Sakamaki, a boy bored with the entire world. One day, an envelope arrives for him. The moment Izayoi opens the envelope, he is transported to an alternate world. There, he discovers that two other "problem children" were transported by envelopes as well — a taciturn girl named Yō Kasukabe with a cat, and a beautiful yet haughty girl named Asuka Kudō. A girl named Black Rabbit (Kuro Usagi) summoned the three to the community "No Name" to overthrow the devil.
Note : Taro Tatsunoko launched the light novel series with illustrator Yū Amano in April of 2011, and Kadokawa's Sneaker Bunko imprint has published five main volumes and three short story collections so far. Rio Nanamomo is launching the official manga adaptation of the story in the same September issue of Comp Ace, while Anri Sakano is launching the spinoff manga in the September issue of Fujimi Shobo's Age Premium magazine on August 9.