Hosomachi Kudō, crushed under inherited debt after his father abandoned him post his mother’s childhood death, survives by crafting a charming facade at an underground Host Club—veiling his detached cynicism. His plight worsens when the True Army demolishes his workplace, pushing his guarantor to blackmail him into piloting Arahabaki’s Garanndoll mecha via organ-trafficking threats. As the sole pilot compatible with the Battery Girls—Rin, Yuki, and Misa, who fuel the machine through their fervent passions—he grudgingly trades flirtatious performance for mechanical warfare, driven by financial desperation.

Sporting dark green hair, crimson eyes, and lightly tanned skin, he dons a tailored black suit paired with a maroon shirt and glasses. Removing these glasses triggers a charismatic "host mode" to manipulate others, though it blinds him physically—a duality mirroring his struggle between survivalist artifice and internal disillusionment.

Initially dismissive of the Battery Girls’ quirks, their relentless zeal reawakens his buried childhood love for *Zaburn*, a tokusatsu series his neglectful father once helped create. This rekindled passion chips at his emotional armor, fostering guarded optimism as he reconciles with paternal betrayal and rediscovers creativity’s value. Despite vocal disdain for piloting, he emerges as Arahabaki’s pragmatic anchor, tempering allies’ impulsivity with tactical calm while nudging the Battery Girls toward self-expression.

Prone to masking turmoil with calculated smiles, Hosomachi gradually embraces vulnerability, shifting from hollow resentment to purposeful leadership. His arc pivots on shedding bitterness over his father’s legacy, transforming obligation into genuine resolve—a reluctant hero forging identity beyond debt, one mecha battle at a time.