Samy Yoshino leads an ordinary life as a Japanese high school student until a shocking event shatters her normalcy. Witnessing bikers assault several girls marks her as their next target. Fleeing her pursuers, she finds aid from an unnamed boy and her loyal dog, Marlon. Despite their efforts, Samy and Marlon are pulled through an interdimensional portal into a strange and unfamiliar world.

Within this other dimension, Samy encounters a witch who has lost her glass eye. Demonstrating compassion, Samy helps retrieve it, only to draw the dangerous attention of demonic forces commanded by the demon lord Noa. Pursued relentlessly, Samy discovers she is central to a cosmic conflict originating at the universe's dawn. Ancient lore reveals that during the primal war between Gods and Demons, the Gods embedded the potential for an "existence with immense power" within human genetic code. This was a safeguard against Noa – twin brother of the biblical Noah – and his demons dominating the next creation cycle. Samy is that prophesied existence, possessing phenomenal latent cosmic powers known as Bodhisattva-class abilities.

Noa aims to eliminate Samy before her powers manifest and thwart his plan to forge a new demon universe. Rescued by the interdimensional heroes Deus, Romus, and Cody, Samy confronts Noa and his warriors, Silver and Beat. Under extreme duress during the climactic battle, Samy's dormant powers explosively awaken. She unleashes her might, decisively defeats Noa, and halts the demonic threat in massive explosions. Following this victory, Samy and Marlon return to their original world. She regains consciousness in her high school classroom, perceiving the entire interdimensional ordeal as an unusually vivid dream, with no apparent memory of the events as reality. A final narrative text suggests the potential for further adventures, though no additional official media exploring Samy's story exists.