MS-Heart is about to start an operation with the newly constructed "Slug Puncher". She finds working with machines more enjoyable than humans, just as they hear someone yelling in the distance. As much as MS-Heart doesn't like humans, they still need them and the two set out to rescue the person.
At the waterfront, Tarma is attacked by Mizuna; Tarma asks Mizuna to stop attacking him, but the latter refuses since he is his enemy. MS-Heart and the Slug Puncher arrive to rescue Tarma and a fight between man and machine begins.
Mizuna's attacks start to damage the Slug Puncher, and in response to its degrading armor, it goes into "Extermination" mode. Mizuna barely dodges an attack from the Slug Puncher, noting that it has become much more accurate. Mizuna and MS-Heart attempt to deal the final calculating blow, just as another voice comes in and stops the fight.
Yoshino sighs as she enters the fray, telling Mizuna that he entrusted his life to her until the day he finally defeats her in battle, and that he gives up faster than her best pupil. MS-Heart attempts to use the distraction to deal the killing blow, but Tarma stops her as he doesn't want her to hurt such a beautiful woman. After a short analysis, MS-Heart finds that fighting Yoshino is too dangerous and retreats, dragging Tarma away from the scene.