On a certain day in August 2017, Asahina Hokuto (朝比奈北斗), a third-year student at Heisei Academy Middle School, and Inami Suu (伊南栖羽), a first-year student at Kamafu Girls' Academy Middle School, arrived at Naha Airport. They were there to participate as test wearers in the operational trial of the 'S Equipment [Storm Armor]' developed in collaboration with the U.S. military by the Sword Management Bureau. On the same day, another sword user arrived in Okinawa: Suzume Yume (燕結芽), a sixth-year student at Ayakouji Martial Arts Academy. They did not know each other and were unrelated individuals. Not yet, at least. This story is a record of their secret struggles. Amidst the schemes surrounding the S Equipment, Hokuto, Suu, Yume, and the elite guard and Maigusa's sword tips intersect. The story set one year before the TV anime 'Toji no Miko' is being novelized for the first time!