The serene streets of the metropolis conceal a bizarre and secret underworld where exotic, supernatural cravings dictate the desires of otherworldly entities known as the Granute. Shoma Stomach, a young man possessing the unique genetic hybrid ability to transform into
Kamen Rider Gavv, finds himself drawn into an escalating conflict centering around a legendary, highly coveted culinary artifact—a mystic package of instant noodles possessing hyper-aphrodisiac and life-extending properties known simply as "Woo!-mai Wakamen."Shoma’s primary motivation is to protect innocent humans from being harvested for their sweet emotions, but the plot thickens when a rogue faction of high-society Granutes, led by the decadent and insatiable Gourmet Baron Luge, attempts to monopolize the Wakamen supply to stage a grand, hedonistic feast that threatens to drain the city’s life force entirely. As Luge unleashes a series of seductive yet deadly monster minions designed to entrap unsuspecting citizens in webs of sensual indulgence, Shoma is forced to infiltrate their underground lair disguised as a celebrity food critic.Inside the neon-lit, labyrinthine pleasure dome of the Granutes, Shoma encounters Sachiko, a brilliant culinary scientist who developed the Wakamen formula as an accidental byproduct of her research into human-Granute coexistence. Sachiko is held captive, her research weaponized against her will by Luge, who plans to use the ultimate bowl of Wakamen to achieve god-like status and limitless sensory power. Recognizing the grave danger, Shoma resolves not only to free Sachiko but to dismantle the entire illicit gourmet ring from the inside out.The narrative reaches its sensual and action-packed climax during the annual Grand Gourmet Gala. Luge prepares to consume the ultimate Wakamen concoction amidst an extravagant display of debauchery and combat. Revealing his true identity, Shoma bursts into the ceremony, transforming into Kamen Rider Gavv. Utilizing newly unlocked snack-themed armor upgrades derived from spicy chili chips and carbonated candy powers, Shoma engages Luge’s elite guard in a visually stunning, high-octane battle of endurance and
martial arts prowess.With Sachiko’s technical assistance, Shoma overloads the giant Wakamen cauldron, causing a massive, harmless shockwave of flavor and energy that neutralizes the Granutes' hypnotic influence over the mesmerized crowd. Luge is defeated in a final, explosive finisher that shatters the underground arena. As dawn breaks, Shoma rescues Sachiko, securing the remaining Wakamen formula to ensure it never falls into the wrong hands again, restoring peace and normal appetites to the city once more.