【How-to】What happens to overhaul - Howto.org

This medicine was created by the Shie Hassaikai, a yakuza organization led by Kai Chisaki, also known as “Overhaul”, who was responsible for the conceptualization of the product itself, using the biological material of Eri to produce it. … Once the bullet hits the victim, the medicine destroys the Quirk almost instantly.