When Sawada Tsunayoshi (blackened, ten years later) traveled to a world where he fought with his own system (such as combat system, auxiliary system, etc.), There were not only humans, but also fox tribes, half-orcs... The school that every student enters will be divided into classes according to level. Each class has a BOSS, and each year's students are composed of each A BOSS challenge will be held in which the BOSS of each class will direct the competition. Also, on the celebration day of the school where they are admitted, students from other schools can challenge the BOSS of the class (such as: King Sees King, Two Sees Two, Single Competition). When Sawada Tsunayoshi comes to this world, what interesting chemical reactions will there be?