Sonico's Manager
He's the guy running Sonico's career—basically her modeling manager. What's weird is that nobody's ever actually seen his face; he keeps that mask on at all times. Beyond the business side of things, he's apparently pretty skilled with a sword, though exactly when or where he uses that skill isn't totally clear. Fans have speculated about what's under the mask for years, but he's never confirmed anything or explained why he won't take it off.
Content compiled by AnimeList.moe from publicly available sources.
