Kōta Kōka is a fiery-hearted competitor driven to claim the title of Bottle King in the virtual Drink World’s Bottle Battles. His name, a playful nod to "Coca-Cola," mirrors the beverage-inspired nomenclature central to his world.

Sporting vibrant red hair streaked with green and crimson eyes, he embodies the "Curtains Match the Window" aesthetic, his appearance mirroring his bold, tenacious spirit. His relentless passion fuels both his clashes with rivals and his unwavering enthusiasm in battle.

Kōta’s quest ignites when he bonds with Colamaru, a Bottleman whose flaming bottle-cap attacks erupt alongside phoenix-themed pyrotechnics. This alliance propels him into fierce competitions, including a rivalry with Hokari Ryo, the "Blue-Dragon Shooting Prince." Initially adversaries, their relationship shifts as they unite against Yujiki and George Muto, adversaries wielding melody-driven combat tactics.

His growth unfolds through strategic trials, teamwork struggles, and alliances forged in high-pressure matches. Mentorship from Suezō Hokari, the Bottleman creator, further cements his place within the competitive hierarchy. Recurring battles and evolving tactics chart his progression, showcasing his adaptability and resolve in the pursuit of victory.