In modern Tokyo, Munhihausen Jr. continues his relentless search for a champion strong enough to defeat the Overfiend and seize control of all dimensions. An unforeseen mishap awakens latent monstrous strength within Nagumo’s cousin Takeaki, positioning him as an unforeseen asset in the descendant’s ambitions. At the same time, Amano Jyaku, his sister Megumi, and loyal ally Kuroko unite to block the scheme, striving to preserve the fragile boundaries between worlds before Munhihausen’s influence spreads further.