At Mashin Academy, the fusion of nanotechnology and martial arts takes center stage. Yeo-Un, despite his mother's unofficial status among the High Priest's wives, is still in the running for the role of Minor Priest due to his father's lineage. As he vies for this coveted position against formidable half-siblings, a cryptic nanomachine injection from a descendant of the future might just tip the scales in his favor.