Despite strict regulations imposed on minors and internet usage, rebellious youth persist in their quest for freedom through clandestine means. Among these rebels is SIRRUT, a group determined to challenge the tyrannical control of Tokyo's influential figure, Fumito Nanahara. By leveraging the power of the web, they uncover the unsettling truth about 'Tower,' a covert entity linked to Fumito that delves into inhumane experiments. As SIRRUT sets a trap in the subway to expose Tower's atrocities, they are met with a sudden onslaught of otherworldly beings. In the chaos, a mysterious young girl named Saya emerges, armed with a traditional Japanese sword to combat these supernatural threats known as the Old Ones. Saya, haunted by the tragic events in Ukishima Province, seeks retribution while unraveling the enigmatic schemes of Fumito and Tower. What dark experiments do they conduct with the Old Ones, and can Saya finally confront Fumito in a final showdown? The stage is set for a climactic battle where destinies collide and the truth stands to be revealed.