Daily Life with Monster Girls and any other property I may mention do not belong to me; this is a non-profit fan work.
Kimihito Kurusu was, by human standards, a seemingly-normal person, if a bit too nice; he had a part-time job, played video games and read manga in his spare time, and was generally an average, if somewhat nerdy, young man of twenty. However, there was one thing that separated him from the average human: his ridiculous durability and strength.
Kimihito had, in the past few months, been repeatedly strangled, bludgeoned, drowned, poisoned, and more, yet has come out relatively unharmed each time. He has also shown incredible strength, being able to punch two adult humans several meters away, through a window, and into the street, to name one example. These feats only began happening when he was accidentally forced into hosting a liminal, or 'Monster'. Why is that?
Mister and Misses Kurusu, though officially out of the country to work, were actually attending a year-long gathering of magical humans known as 'Mage-Con'. The event, taking place in the deep woods of northern California, United States of America, featured dozens of different magical styles, each coming together to share stories and spells, perform rituals, brew complicated potions, purchase items such as foci or alchemical ingredients, and more.
Mr. Kurusu was there to help train the newest generation of warlocks, their numbers having increased dramatically since liminals were made public. Many had made a pact with a demon, fae, or other magically-contracting creature without actually reading the contract or fully realizing what they were signing up for; it was frustrating, to say the least. He did, however, have the pleasure of meeting several couples who had gotten together thanks to the Extraspecies Exchange Act, which was always nice.
Mrs. Kurusu, being one of the greatest witches of her generation, was one of the head organizers, and dedicated her time to aiding rituals and potions, teaching new witches, making sure the significant number of idiots who made particularly deadly or dangerous creatures their familiars didn't cause any issues, and just generally making sure everything went smoothly.
They had wanted to bring their son along, but he, like many prospective sorcerers, natural-born magical humans, had yet to discover his 'trigger', an object, emotion, or person that allowed them to use magic. They of course called him at least once a week, but there didn't seem to be any new developments. He always seemed to be rather tired, actually, both physically and mentally; they feared he was having trouble at work, or maybe even an aggressive neighbor, perhaps even a liminal.
Lala the Dullahan, though secretly not a powerful agent of death (and if you tell anyone, she'll kill you!), was still a low-level spirit worker, more commonly known as guardian angels or spirits. She was actually on a mission: to determine why the young man known as Kimihito Kurusu was apparently immortal. His body and soul simply refused to die, even the worst lethal situations being near-death experiences at the most. Her own powers were unable to determine the cause, so, after consulting her superiors, she was given permission to use a powerful and extremely valuable artifact known as Odysseus' Divining Rod, named for its ability to detect and identify magical effects no matter what.
Upon using the tool, however, she was shocked: he was a sorcerer, his trigger was liminals, and his ingrained ability was 'limit breaker', whatever that meant; the divining rod, for all its power and knowledge, did not give her any more information. She would have to consult her superiors on this.
Apparently, 'Limit Breaker' was an extraordinarily rare sorcerous ability owned by a handful of individuals who would come into their magical powers during times of crisis or great change. It allowed them to endure what would kill a regular person and perform great feats of magical and/or martial strength.
As far as her universe's afterlife knew, only seven other people currently had such an ability throughout the twelve known universes; one had broken his limit breaker and become strong enough to kill literally anything in one punch, two had become and defeated literal gods, one had successfully tamed a great ethereal demon beast and actively used its energy without negative repercussions, one had achieved willpower enough to endure hundreds of stolen shadows by age seventeen (thanks in part to a curse), one had become a substitute Shinigami more powerful than his universe's head death god, and one had managed to kill a phoenix god incapable of dying.
Thankfully, Kimihito's limit breaker was just giving him immortality and extreme durability instead of god-level strength or abilities.
Shit.