SWORD's "O" is Oniya High School. It is the most evil high school in the SWORD area, divided into part-time and full-time schools. The full-time student Hanaoka Kaede Shio (Kawamura Kazuma) came to Suzuran Boys' High School in Toarume City in order to find Lao, the strongest man with many legends. At this time, the bad boys in SWORD who are aiming for the position of the leader of Oniya High School are also waiting for the opportunity... Among them, Tenkai Kohei (Miyama Ryoki), the leader of Setomon Industrial High School, which is called the "Blood Gate" and wears a crimson student uniform, has obtained the help of the strongest man, Susaki Ryo (Nakamoto Yuta), and has brought Kamasaka High School and Emara Commercial High School, who also aim to control Oniya High School, under his command, establishing a "three-school alliance" and continuously expanding their power. Takashiro Takashi (Yoshino Kitato) and Yosuke Todoroki (Maeda Koki) of Oniya High School soon noticed the suspicious behavior of the Three Schools Alliance... At this time, the Three Schools Alliance suddenly appeared. Finally, the Three Schools Alliance's hunting operation for Oniya High School began. The men of Oniya High School were attacked. In a completely disadvantaged situation, can Kaede Shixiong, who has been answering with his fists, protect his partners who have been defeated one after another! ? So, Kaede Shixiong and the strongest assassin of the Three Schools Alliance, Susaki, started a peak showdown! What will Kaede Shixiong's fist tell? The decisive battle to compete for the true top has begun.