how did arisu sakayanagi lose her leg
Arisu Sakayanagi, the brilliant strategist from Classroom of the Elite , didn't "lose" her leg through any dramatic accident or injury—it's a condition she's had since childhood.
Core Reason
Her leg weakness stems from congenital heart disease , a lifelong medical issue that limits physical activity, keeps her petite in stature, and requires her to use a cane for mobility. This isn't a recent event or plot twist; it's established early in her backstory, shaping her reliance on intellect over athletics to outmaneuver rivals like Kiyotaka Ayanokoji.
Backstory Details
- Diagnosis in Childhood : Arisu was identified with this heart condition young, leading to weak legs and no participation in sports or combat—pushing her toward genius-level mental dominance.
- White Room Connection : Her father brought her to the secretive White Room facility, where the disease already impacted her, fueling her rivalry with Ayanokoji as she proved "superior DNA" through brains, not brawn.
- Daily Impact : At school, she navigates exams and events with accommodations (like early bonuses for her group), but skips physical challenges like sports festivals or relays, sometimes costing Class A points.
Fan Theories & Forum Chatter
Fans on Reddit speculate wildly—some claim her disability is "fake" or exaggerated for strategy (e.g., a Volume 0 spoiler theory tying it to White Room genius grads), but canon sources confirm it's real and congenital. Others debate school penalties for her absences, like in Year 1 Volume 3 or island exams, highlighting how her condition realistically hampers Class A despite her smarts.
"Arisu suffers from a congenital heart disease that limits her physical activity and makes her legs weak. Because she cannot engage in sports or physical combat, she has focused entirely on developing her intellect."
No "loss" via trauma appears in light novels, anime, or reliable wikis—fanfics sometimes invent accidents, but they're non-canon. As of 2026 discussions, this remains unchanged in the series.
TL;DR : Congenital heart disease caused lifelong leg weakness, not an injury—turning her into a chess-master villain who thrives mentally.
Information gathered from public forums or data available on the internet and portrayed here.