The body of an earthling is strange. It feels good! Yulia, a mysterious alien girl who appeared in Shinji's apartment without any connection. Shinji, who has been vacantly tied to the resistance of reason before the cosmic huge breasts, decides to help find Yuria's older sister, Alisa. Sheryl, a big-breasted girl who is as good as Julia, and she sneaks into a hotel while walking around the city relying on scarce information, but she is ... actually Alisa. However, Alisa is in trouble with Alisa ...