Kei Matsumoto is employed in a planning division of a fast-food enterprise. One day, unexpectedly, he falls head-over-heels in love with Iwakiri Shinji, the manager of the most lucrative outlet. Consequently, Iwakiri begins to relentlessly pursue Kei with advances that border on sexual harassment! Despite Kei's efforts to sidestep Iwakiri's flirtatious behavior by focusing on work, he finds himself vulnerable to Iwakiri's capricious mood swings – from playful to serious!