The history of 300 years ago, the family that no one has taken over, an ordinary good-for-nothing, living an unlucky life as always, stumbled up the stairs, on the first day of high school, was chased by a dog and lost his way, but encountered a mysterious encounter. The young class teacher, the night-shrinking man who came from the rooftop and asked to stay at my house, what is hidden under the ground of the ideal high school, what is the relationship between the baseball ace and the legendary demon sword, the two "guests" who came all the way from Russia are going to be my servants, the scary girl who destroys roads and buildings, sometimes gentle and sometimes extreme The President of the Student Union... On the surface, there is a sports competition between schools, but the lives of the contestants are used as bets. The inexplicable events seem to have no connection, but they are like pieces of time that are pieced together and connected, slowly awakening the memory that has long been erased. Who is the real murderer who made the world bleedin' and rivers of blood 300 years ago?