At first glance, Ibara Naruse and her friends Aoi Fukasaku and Taeko Nomura look like average, carefree high school students. But the streets they walk on, their destination, and their surroundings are anything but normal. As they continue forward, the trio find themselves stepping deeper into an uninhabitable version of Tokyo, one that has been ravaged by a nuclear disaster 20 years ago. As part of the Dispatch 3rd Special Force Coppelion, known as the Health Care team, Ibara, Aoi, and Taeko are supported by the Japanese Ground Self-Defense Force (JGSDF) and Colonel Onihei Mishima as they scour the eerily silent streets for survivors. Finding the last remaining humans and having them evacuated by the JGSDF's helicopters is a daily occurrence for the girls. But as their work progresses, Ibara and her friends start to question their own humanity—namely, how they themselves are able to survive in Tokyo without any protective gear.

Shi Miao simply cannot stand her lazy, stupid, and unreliable elder brother Shi Fen, who is one year above her at the same high school. Though the two siblings can only depend on each other, Shi Miao's violent tendencies combined with Shi Fen's knack for causing trouble cause them to fight constantly. And so, Shi Miao can only hope that someone might take her brother away—even though, when push comes to shove, Shi Fen always tries to do what he believes is best for his cute younger sister.

Tatsuya Yoigoshi, a once nationally recognized soccer player, is now a first-year student at Noukin High School. Due to his developed hatred for sports, he has abandoned his previous aspirations to become a famous livestreamer on the internet. One day, Souma Azemichi, a first-year on the kabaddi team, seeks to recruit Yoigoshi and spontaneously interrupts his livestream. Without any expectations, Yoigoshi follows Souma to the school gym, where he witnesses second-years Kyouhei Misumi and Shinji Date engaged in the primal contact sport of kabaddi. Despite ridiculing the rules of play, Yoigoshi is stunned by the intensity of the round. Because of an enticing deal and slight coercion, he agrees to settle the prospect of his recruitment through the most invigorating way: a battle of kabbadi, a team sport played empty-handed.

Violence, name-calling, and humiliation are a daily reality for high school student Park Hyung Suk. Chubby and insecure, he is often used as a plaything and punching bag for bullies, which leads him to wish he could just disappear. Unexpectedly, when he transfers schools in the hopes of starting anew, a miraculous opportunity emerges: he awakens in a tall, handsome, and strangely athletic body. Hyung Suk quickly realizes that he is now the owner of two disparate bodies; when one falls asleep, he wakes up in the other. Feeling like he has won the lottery of life, Hyung Suk enters his new school as this attractive and strong young man. However, it soon becomes evident that being a popular student is not all smooth sailing. From girls wanting him only for his good looks to delinquents picking fights out of jealousy, he can never seem to escape trouble. In trying to balance his two different lives, Hyung Suk may find both of them to be sources of ceaseless challenges.