Origin
Japan
Monk Mask was a Smiling Mask under the control of Rikuya Yoshida. He seemed to be proficient in Karate, seeing as it was his primary fighting style.
High-Rise Invasion
High-school girl Yuri suddenly finds herself on the rooftop of a high-rise building. She's trapped in a bizarre world surrounded by skyscrapers, where a masked man cracks open a man's head with an axe before her eyes. She escapes from the masked man and tries to reach her beloved brother, who is also trapped in the bizarre world she's found herself in. Yuri proceeds to cross many high-rise buildings and take down every masked man along the way to find her brother and go home in peace. This marks the beginning of her adventure, which will span the wholeness of the realm they're in...and will reveal its truths.
