Tamao Hatenashi is a 26 year old actor. Due to his unhinged imagination however, he gets an erection each time he acts, rendering him virtually unhireable. In spite of his problem, his luck takes a turn for the better when a fellow actor friend by the name of Maebari introduces him to Gonza, the CEO of a pink movie production company, and who immediately takes a shine to him. Buoyed by seeing his name printed on a movie script for the first time, Hatenashi immediately makes his way to the pink movie set.  Upon arriving, he meets Yumika, the movie’s lead actress. Smitten by her kindness, he soon falls head over heels in love with her. As such, Hatenashi is horrified when he discovers that Yumika has been abducted from the set by a suspicious group of men, leaving only her panties behind. In order to track her down, Hatenashi immediately heads to Shimbashi, Tokyo in search of a legendary detective.

Sex Detective Hatenashi

Then one day, her daily life suddenly changes. Unknown creatures fly out from a large number of spheres sent from outer space and begin to parasitize and manipulate human beings. The parasites not only move in strange ways, but some of them also exhibit extraordinary physical abilities.  Trapped in a building at work, Shang and his colleagues discover that the space creatures are vulnerable to cigarette smoke. But that was only the beginning of the fight to the death. Smokers vs. space creatures, who will survive?  Shang's cry echoes through the air. "Breathe in the smoke and go to hell!"