Yoshitake, your average company drone, is out for a drive one night when he spots a UFO and crashes his car. When he next opens his eyes, he's in his apartment, and next to him is a stunningly beautiful alien girl named Lune! She has come to Earth to save her species from extinction by claiming human seed-and sex-crazed Yoshitake is the perfect mate. Unfortunately, Lune's alien physiology leads to an unexpected difficulty that even the world's horniest man may be unable to overcome.
FROM HORNDOG TO...SLAVEBOY!

At the café Yoshitake and Lune visit, Yoshitake has a fateful reencounter with his childhood best friend, Sakuya Soga. From that day onward, something changes within Yoshitake. No longer is he trying to get down and dirty with Lune and Haruka, and even Rima's brazen attempts to seduce him go completely ignored! As all the girls in his life learn of his past, Yoshitake goes out on a date with Sakuya, where he is unable to say no to her nasty commands because of a promise he once made to her...