Hachiman Hikigaya is an antisocial high school student with no friends or girlfriend and as a result has a distorted view on life. When he sees his classmates talking excitedly about their adolescent lives, he mutters, "They're a bunch of liars." When he is asked about his future dreams, he responds, "Not working." A teacher gets Hachiman to join the volunteer "service club," which happens to have the school's prettiest girl - Yukino Yukinoshita.

Shy Natsu awakens as part of a group chosen to ensure the survival of humanity. Together, they have to survive on a changed Earth.