Atsuhiro's Quirk allows him to "compress" anything in a spherical area into a small marble without actually damaging it.
If used on a person, it effectively entraps them, terminating the fight instantly and allowing Atsuhiro to abduct them easily. The weight of the compressed objects is reduced considerably, making it possible to carry them in one's pockets or even in one's mouth.
Atsuhiro can release a single marble by wishing it, or all of them at the same time by snapping his fingers. He can also use the Quirk on himself and then disengage it to avoid an attack. The compression is done by touching the target and it appears this Quirk can be used in absolute stealth, without noise and before the victim can attract the attention of nearby allies.