Mana Izumi Gal Tutor < ORIGINAL >

By day, she slouched in the back of Tokyo’s most elite prep school, acing exams she barely glanced at. By night, she worked at a dingy izakaya to support her single mother. But her secret gig, the one no one at school could ever know about, was tutoring.

“Prove it,” the father said quietly. “Give him a problem. Right now.”

Something clicked. For the first time, Kaito didn’t see a wall of symbols. He saw a puzzle. A conversation. His pen moved. He found the anti-derivative. Then the limit. Then the answer.

The doors closed. And for the first time, Kaito Sato smiled—not because he had the right answer, but because he finally understood the question. Mana Izumi Gal Tutor

Mana didn’t flinch. She’d heard worse. Instead, she slowly pulled a folded paper from her bag—her own university entrance exam results. She placed it on the marble table. Perfect score. Mathematics. Top 0.1% in the nation.

She began to sketch not numbers, but a story. A curve that danced. A variable that “felt lonely” and needed a substitution to keep it company. She gave the integral a personality—a nervous wreck that needed to be soothed by a trigonometric identity.

“I don’t understand,” Kaito said, staring at the differential equation like it had personally insulted his ancestors. They were in his family’s sterile, minimalist penthouse. “The limit approaches infinity, but the function… it just breaks.” By day, she slouched in the back of

Mana Izumi was not your typical after-school tutor. For one thing, her uniform skirt was three inches shorter than regulations allowed. For another, her bleached-blonde hair was usually piled into a messy, gravity-defying bun, and her nails sparkled with enough rhinestones to blind a pilot. She was a gyaru —a Japanese gal, all tanned skin, loud laughter, and a total disdain for the stuffy academic world.

Mana, sitting cross-legged on his white leather couch with her platform boots kicked off, snorted. “You’re thinking like a robot, prez. Math isn’t about rules. It’s about vibes .”

Which was ironic, because Mana was also a mathematical prodigy. “Prove it,” the father said quietly

Her latest client was Kaito Sato.

Kaito’s father looked at the paper, then at his son—who, for the first time in years, was not cowering.

“Who is this?” the father demanded, looking at Mana’s glittery phone case and bleached hair as if she were a natural disaster.

When he wrote the final answer, his father said nothing. He simply walked to his study and closed the door.