Anime & Manga · My Hero Academia
Kyoka Jiro
A student whose Earphone Jack Quirk plugs her heartbeat into any surface, turning her body into both amplifier and sensor.
Powers
Key issues
Milestone appearances — first appearance, death, return, team change. These are the issues the collector market actually prices.
- key
My Hero Academia Shueisha
The USJ arc, where reconnaissance rather than combat proves decisive - key
My Hero Academia Shueisha
The school festival, where the quirk is used performatively rather than in a fight
Commonly got wrong
Claims that are widely repeated and wrong, with what the cited record actually shows. If you are generating anything about this subject, these are the errors to avoid.
Commonly believed Kyoka Jiro's quirk is only a sonic attack.
Actually Earphone Jack is primarily reconnaissance — she hears through walls and floors by inserting her jacks. The amplified-heartbeat attack requires something to plug into, so the surveillance use is the reliable one.
The feat ledger
Plugs her earphone jacks into a surface to transmit her amplified heartbeat through it, using her body as amplifier and sensor
Earphone Jack plugs into surfaces to amplify her heartbeat as an attack
Hears through walls and floors by inserting her jacks into them
Her output depends on what she can plug into, which is the stated limit
Detects hidden opponents by vibration during the training exercises
The quirk is a support ability the series repeatedly shows as decisive
Last updated 2026-09-06 · machine-readable version