Naoko-san is an alien from the planet Yuri, who is plotting to conquer the Earth by yurifying it. Misuzu is a junior high girl and is always troubled by Naoko-san, who lives on the roof of her house.

Naoko-san is an alien from the planet Yuri, who is plotting to conquer the Earth by yurifying it. Misuzu is a junior high girl and is always troubled by Naoko-san, who lives on the roof of her house. They hear rumors that a molester is wandering around in the area, so they decide to investigate.

The surreal gag manga follows a quiet, timid girl named Misuzu whose older sister Naoko is returning from studying aboard. However, when she hurries home to meet her sister, Misuzu instead encounters Naoko-san, the strange alien from Yuriland who loves eroticism, yuri, and girls.