Luo Lan, who is addicted to the Assassin game, was invited to a real Assassin game "Assassin League", but its battlefield is not reality, but a fantasy world. For example: "Sword Art Online: Origin", "Cabaneri of the Iron City: Dark Light", "Naruto: Destiny"... All players participating in the real Assassin game must complete their only mission to return to reality. In the fantasy, all actions will be allowed, and only the truth will be excluded. Every assassin will become a dead bone on the battlefield when he loses his mystery!