Chen Yan, a 32-year-old game designer, had been living the monotonous grind of a corporate drone, his only comforts the Kamen Rider figures hidden in his desk drawer and his grandfather’s vague childhood words: “The belt can protect the world.” Then the battered belt his grandfather left behind was accidentally activated, pulling him into a “Boundary Rift Crisis” spanning multiple Kamen Rider universes. The Gurongi in the Kuuga world have been tainted by gray mist, the Riders in the Ryuki mirror world have become puppets, and the Orphnoch in the 555 world are mutating at an accelerated rate. Once-independent worlds are collapsing as an unknown force makes them collide. Ordinary people are swallowed by “boundary rift mist,” and the power of the Riders is their only salvation.
Chen Yan’s belt isn’t an ordinary transformation device. It’s a “Boundary Rift Harmonizer” that can travel between worlds, but it also binds him deeply to the “source of corruption.” Every transformation increases the risk of his own mutation, and saving one world may cause another to collapse. He is forced to learn restraint in the Kuuga world, confront the moral dilemma of “to kill or not to kill” in the Ryuki world, accept the despair of “all your efforts may come to nothing” in the Blade world, and stand against the extreme ideology of “destroying in order to save” in the Decade world… From a corporate drone who avoided fighting to a “Boundary Rift Walker” who can stand alongside Tendou Souji and lead the alliance of all Riders, he is forever caught between “protection” and “the price it demands.”
As the journey goes on, his grandfather’s past gradually comes to light: he was once a Smart Brain researcher, a student of Ongekijutsu, a guardian of the Boundary Rift core, and the creator of the Decade belt. His unfinished “Balance Plan” is the key to solving the crisis…
