Through his Quirk, Chisaki is able to disassemble and then reassemble anything he makes physical contact with. A target that gets touched by him gets instantly obliterated, feeling intense pain and losing consciousness, only to have their bodies restored later, with all chronic illnesses and injuries cured. It's unknown if the restoration process is voluntary on Chisaki's part or not.
When Chisaki utilizes his Quirk, his body appears to get rashes all through it, causing major itching. He also wears a pair of medical gloves presumably as a protective measure to avoid activating his Quirk by accident against unwanted targets.