At 17 years old, Katsu Kaizou is a high school student who possesses a penchant for science fiction and has a quirk for believing in the paranormal- from aliens, UFOs, ghosts, and even conspiracies. He is remarkably gullible, often succumbing to the idea that everything around him is part of some extraterrestrial plot meant to dominate the earth. Each tale is unique and intricate, with Kaizou finding himself thrust into bizarre situations where he encounters unnerving things like animated wooden figures, lethal sushi, absurd bathroom weapons, horrifying infections, robotic incursions, apparitions, animate dolls, and more! Kaizou eventually becomes a member of the school's science club, allowing him to form new alliances, making him privy to even more alien phenomena.