Tatsunari inhabits a world split between "forks" and "cakes," where forks perceive flavor solely through cakes' bodily fluids. This biological reality casts forks as predators and cakes as prey, fostering widespread distrust of forks as potential criminals. He is a fork who meticulously hides this identity. Despite his school popularity, he navigates constant fear of exposure and the stigma attached to his nature, vigilantly controlling his true self to evade detection.

His tightly managed existence fractures during an encounter with a junior student on the library committee, an honor student who is a cake. While saving him from an accident, Tatsunari accidentally tastes the junior's sweat. The experience overwhelms him—the taste is uniquely sweet, pleasurable, and intensely delicious. This single incident ignites an all-consuming obsession within Tatsunari. The junior's flavor becomes his sole focus, forcing a brutal internal conflict: his predatory fork instincts war against his overpowering attraction and craving. He finds himself unable to resist loving him.