It's been three months since Genesis impacted Earth, reshaping the world as humanity knew it. With modern society poorly equipped to handle the introduction of [Classes], [Skills], and most importantly, [Dungeons] spewing forth monsters, the dust has only just begun to settle. The paradigm of the new world is simple: grow strong or be left behind. Unfortunately, twenty-year-old Autumn Parker falls solidly in the second camp.

Even before Genesis, Autumn was someone of little importance, a second-year college student struggling to make ends meet. Morphing power hierarchies where strength matters most has only made her situation worse. And to make things even more embarrassing, she's one of the few people blessed with a class—but despite her best efforts, she can't activate her fundamental skill, [Summon]. Stuck with the strength of nearly a regular human, Autumn struggles to clear even the weakest of F-Tier dungeons.

Her hopeless toiling comes to an abrupt end when, under unusual circumstances, she activates [Summon] almost by accident. Her first conjured familiar springs forth, and she isn't what Autumn expected.

A succubus.

Bonding the demon-girl comes a potent side-effect, too. Something new between her legs, a weapon to help her ply her newfound branch of magic.

Though her future looks much stranger than before, it also looks far more promising. And … stickier. But Autumn is intent on carving out a place in the world, regardless of her class's bizarre manifestation. There's power out there, waiting to be claimed—and she'll be the one to seize it.