Mika and Mako are close, seemingly ordinary schoolgirls. However, they share a secret that no one else must know—their intimate relationship of penetrating each other's anuses with a strapon. In empty classrooms and hidden places where no one can find them, they indulge in their secret garden time. Their greedy anuses, never satisfied even with two fingers stuffed inside, repeatedly reach climax through vigorous strapon piston thrusts. This is the passionate story of their anal love.