Mask De Masculine is the Stern Ritter S rank of the Vandenreich.
Mask De Masculine () is an antagonist of the BLEACH series that was created by Tite Kubo, It first began serialization Shueisha's Weekly Shonen Jump in August 2001. He was first introduced during the The Thousand-Year Blood War Arc that began in Volume 55.
He first appeared in BLEACH Volume 56 CH. 495 "BLEEDING GUITAR BLUES".