A series of natural disasters has reduced the world to rubble, with the survivors doing whatever they must to survive in a world gone mad. But one young boy, Kakugo, gifted with amazing martial arts and a superpowerful suit of armor by his late father, has been charged with making the world (or at least his school) a safer place. But his sister has a matching set of skills and equipment, and she`s on a mission to bring peace to the world... by wiping out humanity!

Mika Katagiri wants her band to perform at the upcoming local festival. However, complications arise. Their keyboardist, Jun, refuses to play, and their stage has been cancelled. Refusing to give up, Mika and her band strive to find a way to play at the festival, using any means necessary.

"First muscle training animation ever," a 16-year-old girl named Hinako leads exercises in push-ups, sit-ups, and squats. Hinako was once a human, but she was turned into an anime character when she was a second-year middle-school student.

At the time of the ceremony of entry to the college, a young boy named Ushino Hayama finds Sara a girl whom he met ten years ago. From this day, a change has taken place in him, and notices that can now control some water. After having succeeded the swimming championships, he discovers deep sea diving.