Tokoshie X Bullet: Kaijuu Gakuen

in 2030, the world's largest cities were destroyed by terrorists manipulating unidentified giant weapons. they called themselves “tokoshie” and destroyed the city with overwhelming power … then disappeared. twelve years later, in 2041, tokyo. a transfer student appeared in front of tsukimi, a high school boy who spends his days closed. from the day i met this boy who was somewhere away from the world, tsukimi's “life-threatening school life for the survival of humankind” began!