Reborn as a handsome guy in Tokyo, Azusagawa Kyosuke only wants to study hard, get into the University of Tokyo, and build a fulfilling life as a lawyer or doctor.
After years of hard work, on this day in his second year of high school, the Alien Species Diplomatic Relations Act is suddenly passed. As elves, vampires, succubi, and other nonhuman girls begin appearing in society, he realizes something.
He didn't reincarnate. He transmigrated into a yuri eroge world called Alien Species: XP Trajectory.
And he's a villain who gets blasted by a magical girl early in the story.
It's easy enough to distance himself from his villainous identity, but what gives him a headache is that his stepsister, the magical girl who is the game's protagonist, does nothing but tell him to drop dead and call him a loser.
His fists clenched.
So, in addition to distancing himself from his villainous identity, teaching his bratty stepsister some manners became one of his goals.
On the first day he met her, he saw her carelessly kick off her shoes, speak rudely to him, and treat him with utter disrespect.
So Azusagawa Kyosuke smiled and spoke to the brat.
"Hey, Ryoko-chan, being a magical girl is a secret, right?"
"You don't want Mom to find out you're a magical girl, do you?"
What Azusagawa Kyosuke hadn't expected was that his stepsister, as the protagonist of an eroge, would have such a filthy mind that she twisted his lessons into something like this.
And one brat would be one thing, but why are all the other heroines like this too?