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Japan was no longer a safe place.
You couldn't be in the streets after dark, perils lurking in the corner of your eye and fading from sight as you look. But don't be mistaken, I'm not talking about rogue bombers or evil samurais or robbers. I mean something FAR worse. Something that literally SCARED away all THREE of hose dangers away to the unknown.
This country was plagued with an alienonic race of creatures, dubbed "sex beasts". Their name was true to their nature; the beasts had come from every single trench in the ocean and spread throughout Japan quicker than anime fanservice.

Sex beasts, at first glance, had varying effects on citizens. Some were astounded by their gelatinous form, others were terrified by their menacing appearance and frightening demeanor. Regardless of what we thought of them, they made their space in our cities and other inhabited areas.

That was when it happened....
The sex beasts began mating with females. No woman OR girl, no matter how old or young, was safe. Children, Babies, Teens, Adults. Sex beasts didn't care. They looked at humans as only a way to reproduce; Certainly, we wouldn't LET them just invade and rape women at will.
Numerous companies and organizations developed weapons to fight them, the result? Hundreds to Thousands of casualties, millions lost in weapon development, and a tragic increase in sex beast population, effectively DOUBLING the risk of a rape attack.

One interesting quality that draws sex beasts and men closer was young women. Notably, as sex beast numbers increased, so did the rape-and-death rate of schoolgirls. Busty, petite, skinny, pretty, whiny, nerdy. The beasts appeared capable of reproducing with ANY LIVING BEING.

Worser yet, they'd spread EVERYWHERE. Every residential neighborhood had AT LEAST ONE SEX BEAST, ours had at least twelve. Unidentified and brutal, they hardly cared for the health of their victims, hell, I don't think they even cared about reproducing. Pleasure and sexual gratification was all that mattered.

My school, Haru Saka High, had once been attacked.
Three sex beasts, who I'd soon known as Bene, Zawa, and Leven, burst in without warning and slew any who opposed them.

It was a massacre, girls scrambling for a place to hide or escape. Men were killed whenever they tried defending them, ripped apart by the sex beast's tentacles and ocasionally devoured whole.

Bene, fond of bustiness, had immediately targeted cheerleaders and popular students. He ripped off their clothes in less than a second, alotting no mercy and simply dropping girls to target the next.

Zawa had raided the showers and locker rooms, going so far as to press girls into lockers and rape them into the wall. Insastiable groans of joy and screams of pain echoed past hallways, so loud nearly the whole school could hear.
Leven, however, had caused the most damage. He went after staff, popular kids, jocks, professors, students, and anything rape-compatible. Blood and semen followed him, he hadn't even bothered to release the girls he'd assualted, letting them passively slide or fall off of his phallus as he raped the next girl.
I was lucky to have escaped into the airducts with a few others in the women's bathroom. Kaifu, an average girl with more smarts than wit, hadn't been so lucky.
She, as well as 4 other girls present, was propped against the wall instantly as Leven bursted in. I'd seen the whole thing, ignoring my friend's pleas to hurry up. I can't say I didn't vomit, viewing the beast's violent thrusts and the blood splattering from between Kaifu's legs. Leven spotted my lunch plop on the bathroom tiles, looking up to see me gagging.

A tentacle gripped the vent and, with one pull yanked off the bottom. I held back a scream, crawling away as more and more tentacles chased after me. I twisted around, crawling at full speed while still supressing my screams of terror.
A cold, moist substance wrapped around my leg, I was pulled down against my will. I wailed my arms and free leg around, the beast's grip was firm and intent on not letting me escape. Leven sneered as he dropped me on the floor and plodded me against the wall. With a simple tug, he tore off my schoolgirl uniforma, seconds before Bene and Zawa sludged into the bathroom....