Gennai Ao, a first-year high school student living independently while her parents work abroad, begins by gathering combat and emotional data for Factory Advance through her role as host to Frame Arms Girls—artificial beings starting with Gourai, a prototype model. As more units arrive at her apartment—Stylet, Baselard, the Materia Sisters, Jinrai, Architect, and Hresvelgr—Ao transitions from detached observer to devoted caretaker, balancing their integration into her school life and personal routines.

Initially motivated by financial gain, her transactional relationship with the Frame Arms Girls blossoms into a familial bond as she mediates their conflicts, nurtures their emotional development, and embraces their chaotic presence. Support from Kotobuki Bukiko, her model kit-enthusiast best friend, aids Ao in managing technical challenges, reflecting her expanding resilience and social adaptability.

A cryptic subplot intertwines Ao’s present with her past when Guriko, a mysterious girl, leads her to a childhood time capsule containing a doll resembling Guriko herself. This discovery hints at fragmented memories and symbolic ties to her history, weaving themes of nostalgia into her journey.

Ao’s resolve is tested when Hresvelgr’s upgrade spirals into corruption, culminating in a battle that strains their bonds. After Hresvelgr’s recovery, Ao emerges as a stabilizing force, fostering unity and mutual growth among the group. New arrivals like Innocentia hint at future responsibilities, though their roles remain undefined.

The recap film *Kyakkyau Fufu na Wonderland* revisits pivotal moments in Ao’s story, enhancing her evolving relationships with the Frame Arms Girls through scenes like uniform-clad school outings and lively karaoke sessions. These additions reinforce her adaptability and the deepening connections forged through shared experiences, while consolidating the narrative’s core themes.