The focus of the tale is a subterranean blockade beneath Tokyo that divides our realm from malevolent entities of an alternate universe. The Hirasaka clan has been tasked with safeguarding the blockade for generations. However, in recent times, a covert scheme orchestrated by unidentified culprits has been gradually eroding the impediment. Tokyo's destiny now rests on the shoulders of an individual who is determined to seek revenge. [ANN]