Misu Heart, the sole female member of Battle Future, falls into a trap set by the evil organization Dark Society Egoma, which seeks to dominate the world. She is captured and locked inside Egoma's hideout with her body tightly bound in rope and a time bomb planted on her. Desperately struggling to escape, she finds the ropes impossible to untie. Egoma's commander, Gerda, mocks her efforts and torments her mercilessly, ultimately leading to a tragic BAD END.