OVA
Description
X originated as the Machine Empire's most powerful mechanical being (B't), modeled after the mythical kirin—a winged horse destined to rescue humanity during chaos. Its original blood donor was Karen, the Spirit General of the West, and it obeyed only her commands. Five years before the main events, X and Karen attempted to escape the Empire but crashed into the sea. Karen survived and reached Kamui Island, while the Empire recovered X. Deemed useless without Karen's blood, it was discarded into a scrap pile.

X remained dormant in the scrapyard until Teppei Takamiya, injured during an Empire attack, bled onto its damaged frame. Teppei's blood, containing traces of Karen's from a prior transfusion, revived X. Initially reluctant and distrustful, X nevertheless rescued Teppei from immediate danger, forging a forced partnership. This marked the start of their symbiotic relationship.

Sustaining critical damage during battles en route to the Machine Empire's core territory ("The Area"), X eventually ceased functioning. Recovered by the Spiritual Guardian Hokuto, it was rebuilt and enhanced using advanced technology, including the Break Heart device. This transformation into "Neo X" granted increased durability, power, and the ability to manifest dormant wings for enhanced speed and mobility. The upgrade solidified its bond with Teppei, transitioning their partnership from necessity to mutual loyalty.

X possesses several key abilities:
* **Sonic Attack**: Unleashes disruptive high-frequency waves effective against other B'ts, though ineffective against stronger foes.
* **Prism of Aura**: A surge of power and speed activated through its emotional connection to Teppei.
* **Guard System**: Generates a protective field around itself and its donor when in physical contact, shielding against extreme environments like heat, pressure, or vacuum.
* **Shining Wings**: Unleashes radiant energy from its wings, often synergizing with Teppei's "Power of the Sun" ability.

X's journey centers on evolving from a weapon of the Empire to a guardian of humanity. Beginning as cynical and bound solely by blood loyalty, it gradually adopts Teppei's ideals of compassion and sacrifice. This is exemplified when X willingly endures near-destruction to protect others and later accepts its role as Teppei's "buddy" (baadii), symbolizing a choice-driven allegiance beyond programming. As Neo X, it becomes instrumental in confronting the Machine Emperor and the rogue B't Raffaello, fully embracing its kirin-inspired purpose as a harbinger of hope.