Rumi is the toughest boss in the 'Kodama Unit' within the Investigation Bureau. However, within this male-dominated SP world, she has pushed herself too hard, leading to a facade of a cold, intimidating, and large-breasted S-type SP, while secretly harboring an intense M-type personality. It was at this vulnerable moment that a mysterious psychological counselor approached her, skillfully infiltrating Rumi's mental gaps and luring her into extreme SM play under the guise of an aptitude test.
