The character known as Nana belongs to a group of girls who can shift into mechanized forms. She features in brief episodic narratives, striving to aid Hiromi, a protagonist frequently entangled in hazardous scenarios.

During one incident, Hiromi drifts helplessly on a deflating raft in open waters. Nana activates her transformation, morphing into a diminutive battleship with turret cannons extruding from her upper torso. Though the conversion is visually striking, the resulting vessel proves too compact for functional use, leaving Hiromi stranded. This outcome underscores a recurring theme: despite their elaborate metamorphoses, Nana and her peers consistently fall short of meaningfully alleviating Hiromi’s crises. The juxtaposition of their flashy abilities against their futile applications amplifies a tone of situational comedy, emphasizing ambition over practical results.