In the distant future of Space Age 216, the exploratory vessel Kikumasa detects a mysterious energy signal far beyond the Milky Way. Crew member Yukino, aboard excursion pod number eighteen and just days from her wedding, encounters an unidentified object that sends her pod into collision. Upon regaining consciousness, she finds herself amidst a group of male aliens, cloned beings who have never before encountered a woman from Earth. As their first contact, Yukino becomes the unexpected focus of their intense and unrestrained curiosity.