The strongest Number Zero Apostle in history, forced by the need to make a living, takes a job that sounds respectable: exclusive guide to heroes from another world. To cut costs and boost efficiency, she comes up with a new work arrangement. Half of her sneaks into the world, puts on a librarian's disguise, and works overtime, while the other half stays in the void to supervise.
This time, her target is a blond boy whom the whole school has judged to be dirt-tier. By day, people step on him in the hallway and call him a good-for-nothing. By night, he comes knocking at the library door.
"Miss Ain, I've gotten lost again."
"I don't understand this theory."
"Do you think someone like me... can really get stronger?"
So the Apostle becomes a kind, understanding librarian, making him tea, finding books for him, treating his injuries, and giving him special lessons. When the whole world tells him he's hopeless, she tells him, "You can do it."
A lot happens after that. A war spanning a continent, the collapse of a thousand-year-old empire, and a manhunt across countless worlds.
It's all under control, all part of the plan. The Apostle nods with satisfaction, then raises her scythe to reap her harvest.
But much later, that blond-haired bastard pushes open the library door.
"You need to understand: I can't be your girlfriend, therapist, mother, best friend, worst enemy, and life coach all at once!" The Apostle cowers in a corner in terror, then finally gives up resisting. "Wah... then... don't tell Ain."
This book is also known as "I Split My Soul in Half, and Somehow I Was the First to Mess Up," "Number One in KPI for Three Hundred Years, Still Pretending I've Never Had a Crush," and "I Was Supposed to Reap the Hero, So How Did I End Up Getting Involved?"
