Paco, the woman who never misses, is tasked to kill Kenzou Makishima. She previously attempted to do so but for the first time in her life, she failed. She is given an ultimatum by her client/poacher. To disguise herself as an "Uma" to bait him.

The Uma are a species that Kenzou is attempting to perserve against the poachers, despite this he is the laughing stock of the scientific community. Without any choice but to finish the job, Paco accepts the job. 

The disguise leaves Paco uncomfortable and given her lack of experience in the forest, as in her words "I'm an urban sniper..." She then got bite by a snake in her left titty, her scream alerting Kenzou. Kenzou finds her and tries to figure out if she's the famed "Uma Magri" or just a regular human. An Uma Magri being an uma with human traits. 

This is when we learn of Kenzou's true intentions. He unclothes and in his words, "As a biologist, I must have carnal relations with her for the sake of science! It's necssary to dteermine how her anatomy differs from humans!" Thus he begins to fuck her silly.

Her client is able to communicate with her through an earpiece and tells her to just take it so she can get the jump on him after he nuts. Unfortunately for Paco, she has to take it for a good 10 nuts before unexpectedly being saved by a real Uma Magri. At this point the client, who has video surveillance, is clearly wacking off to this situation. 

The Uma Magri shot an arrow through Kenzou's head and not noticing Paco isn't an Uma Magri wants to mate with her. Paco continues to be fucked silly by the Uma.