Densuke, a Pata-Pi resembling a small winged robotic companion, begins as a basic electronic pet capable only of emitting a "Pee!" sound. Given to Hibari Hanakoganei by Crane Bahnsteik—a mysterious figure she calls her "prince"—the device’s name carries poignant ties to Hibari’s younger brother, who died at birth, cementing her emotional bond with it.

During crises, Densuke transforms into Aphrodite, a humanoid mecha mirroring Hibari’s appearance with armored enhancements. Triggered by her fierce resolve to protect others, Aphrodite wields superhuman strength, agility, and energy barriers to battle Homunculus threats. Hibari later fuses with Aphrodite, a process demanding a "pure and undefiled heart" and alignment with the Anima Mundi, a group chosen to interface with divine entities called Divas. This fusion amplifies Aphrodite’s power, altering its design to feature green-accented armor and prominent wings. In *Summer Vacation of 2011*, Aphrodite’s aesthetic shifts again, adopting red-and-white armor and wings reflecting Crane’s style.

In the series finale, Aphrodite gains sentient speech, bidding Hibari farewell before sacrificing itself to help divert the Primum Mobile, a space fortress threatening Earth. This act, joined by other Divas, averts disaster but dissolves Densuke. The film depicts Hibari and her Cyber Team allies fusing with their Divas to confront threats within the Primum Mobile, highlighting Densuke’s visual redesign as a legacy of Crane’s influence. Though Densuke’s physical form vanishes, thematic cues imply its essence endures through Hibari’s enduring connection to Crane.

Intertwining themes of grief, inheritance, and technology’s dual nature, Densuke evolves from a sentimental keepsake into a pivotal force against existential peril, encapsulating the narrative’s focus on identity and humanity’s interplay with advanced machinery.