Is Something Wrung?

Hibino Mitsuru, a young schoolboy in 3rd year of middle school, has always knew that there was something odd in him. The first day of school, a new and pretty student called Issha Kouzou is attacked by a classmate named Kamejima. In front of Mitsuru, Kouzou take a desk and tries to attack him but suddenly, the foot of the desk he held broke down and fell to the ground. After the lessons, Kouzou called Mitsuru in the class. Together, they looked in the class and found an iron ring. Kouzou says that is undoubtedly that ring to broke the foot of the desk. Mitsuru answered that he didn't know anything, but suddenly Kouzou took an iron bat and...