Tokyo Species, as the title may suggest is about an alien parasite taking over freshly dead corps of human beings. But somehow, all the dead corpses seems to be young girls which brings in the erotic angle to the movie.
A girl commits suicide. Her body washes ashore. An alien creature takes over her body. She goes home, and nobody suspects what's going on. She goes to school, and her classmates doesn't suspect what's going on either. She then starts to covertly kill victims using the tentacles that seem to come out of any parts of her body. She uses sex to lure the victims. Then a strange transfer student shows up at her class. She's chasing the alien who took over the girl's body.
Thighs seems to be the visual theme of this movie. In the beginning, the girl's face isn't even shown. Only her thighs when she walks around indicates that it's "her". Furthermore, she doesn't speak a word, and no one thinks that's suspicious. Two other girls who are co starring in the movie has their thighs prominently featured throughout the movie. Maria Ozawa has great looking thighs, so she was the right choice for this role.
Aliens, girls, and serial killing, punctuated with sexual scenes is what this movie is about. Don't expect much content in this movie, but it's made very well considering its low budget. Japanese seems to have worked out the formula for these low budget direct to video erotic movies. They know how to put in the eroticism in the right way, and compared to their American counterpart, light years ahead in production quality.