Kaito Yūki, younger brother of Kento Yūki, found himself ensnared within the digital realm when a virus corrupted the Magical Gate. His consciousness merged with the Web Knight Daitarion, narrowly escaping brainwashing. This peril compelled Kento to focus on his rescue, especially after their father’s failed efforts. Initially sidelined from frontline battles due to inexperience, Kaito provided crucial operational support alongside Aoi Arisugawa at the Magical Station.

When threats surged across alternate web dimensions, Kaito’s responsibilities evolved. Despite his novice status, he took command of Wyverion, a wyvern-themed Web Knight. Their alliance enabled Wyverion to fuse with Kento’s Gladion, unlocking the enhanced ‘Victory Gladion’ form. The fusion granted both brothers radiant angelic wings, embodying their united determination.

Kaito orchestrated vital evacuations in crisis moments, using his vantage point to rescue stranded or injured comrades. His transition from captive to contributor highlighted his adaptability, though combat engagements stayed conditional. The fusion dynamics between Wyverion and Gladion revealed his untapped potential, cementing his role as a tactical linchpin in subsequent clashes despite minimal battlefield experience.