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The Mastermind (首謀者 Shubō-sha) is main antagonist featured in Danganronpa V3: Killing Harmony.
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In Chapter 6 the Ringleader of the Killing Game Semester is revealed to be Tsumugi Shirogane, Ultimate Cosplayer (超高校級の「コスプレイヤー」lit. chō kōkō kyū no “kosupureiyā”).
In the last trial, she explains that Danganronpa and the Killing Game they are all currently in is nothing more than mere fiction, a TV show created by Team Danganronpa that exists in order to entertain all people in worldwide. Tsumugi also reveals she volunteered to be the Mastermind-slash-Ringleader of the 53rd Season of the TV show.
The true mastermind behind the ruthless Killing Game Semester is none other than the creator of Danganronpa television show, Team Danganronpa. Has been known for hosting killing game-themed show, the people in worldwide become addicted to it and always begged for more whenever a season reach its ending.
Until now, Team Danganronpa has created 53rd season of killing game, with the Killing Game Semester as the final series since people in the worldwide choose to live in a world without Danganronpa.