The cute comedy manga and anime take children's stories and folktales from all around the world and asks, "what if a cat appeared in this story?"

Takes place in the year 2200, where Japan has become a land of cats as the human population's birth rate has declined. In this future world, cats can talk, learn, and work. The story follows a high school girl and her argumentative cat.

In a world where warriors are respected, Shi Mu's fate seems destined to be different. As the adopted son of an aristocratic family, he is forced to embark on the road of a warrior to find the truth and redeem himself. From the four halls of Fengcheng to the struggle between sects, interests are entangled, and powerful enemies lurk. Every challenge makes Shi Mu more determined. In the end, Shi Mu realizes the power of his bloodline, which not only changes his own destiny, but also affects the future of many people.

Yuuken "Yuu" Enma is an average Japanese high school student preparing for an upcoming kendo tournament. On the night before the competition, however, a black carriage crashes into him. When he regains consciousness, Yuu finds himself at Night Raven College—a premier academic institution in the magical world of Twisted Wonderland. Only a chosen few with exceptional magical talent are admitted into the school, so it is a mystery how a human with no magic ability ended up here. Although Yuu desires to return home, it is easier said than done. While the school's headmaster searches for a way to send him back, Yuu is assigned manual labor around the campus. But due to the chaos at the school's entrance ceremony following his arrival, Yuu has a target painted on his back as far as Heartslabyul dorm leader Riddle Rosehearts is concerned. Yuu meets and befriends Heartslabyul freshmen Ace Trappola and Deuce Spade; yet soon after, Ace and Deuce land in a situation that results in their expulsion. As the pair seek to redeem themselves, Yuu accompanies them on their perilous mission to fix school property. However, forgiveness does not come easily from the "Crimson Tyrant" in charge of Heartslabyul, who may have an ulterior motive behind his strictness.