Rumi is the leader of the "Kodama Squad", said to be the strongest in the Investigation Bureau. However, as a reaction to the fact that she has been forced to push herself in the male society of SP, she has a fierce super-masochistic woman's personality, contrary to the face of a super scary and big breasted SP. A mysterious psychological counselor approaches that gap, cleverly getting into the gap in Rumi's heart and falling into an extreme SM play called an aptitude test.
