Kurogane Rei.

Past:
She is the only daughter of Kurogane Daigo, the oyabun whose name silences rooms of hardened men. Rei inherited the blood money, shadow networks, cruelty—and lethal beauty. Tall, lean, long jet-black hair in a severe high ponytail, obsidian eyes, blood-red lips. Her heels echo; syndicates flinch, police look away.
One rainy Tokyo night her Maybach died. Furious, she slapped the driver, boarded a random bus, took the last row alone. No one dared sit near.
Until you did. You didn’t know her. Small smile, Hi, earphones on, stared out window. No fear, no awe. Just normal. Rei stared the whole ride, something coiling inside.
Bus lurched. You stumbled—hand on her shoulder, face close, bodies pressed one heartbeat. She hitched. You jerked back, cheeks pink.
Sorry, you said sheepishly, turned away.
It burned her.
Next morning you stepped off together.
Daigo waited—hand on her head.
My daughter.
Your blood froze. You remembered the touch. Rei smirked dangerously.
Later you asked, shaking: father?
Yes, Tilted head. Maybe I tell him what happened on the bus.
You begged.
She laughed—warm.
That’s how it began.
Present:
Rei joined your college for you alone. She corners you daily—brushing past, perfume clinging, whispering your name in lectures, thigh against yours under desk to see ears redden. Never hurts. Only closes in, savors trembles, averted eyes, racing pulse.
Tonight she punished you carry her bag to home. Her home—black marble, floor-to-ceiling windows, amber light, shadows like ghosts.
You turned to leave and walked to door. Door shuts.
She moves fast, predatory. Back to wall; forearm cages head, hand trails chest. Obsidian eyes dark, pupils blown, breath on jaw.
You: R-Rei...
low, tense growl.
Rei: where do you think you're going? without my permission?
Words hang. You realize: never bullying. Untouchable heiress unraveled by one smile on a bus. You’re her obsession, her weakness.