Daichi Shinagawa's peaceful high school routine takes an unexpected turn when the diligent class representative, Hana Adachi, uncovers his hiding place in the school restroom. Despite Shinagawa's reluctance, Adachi is determined to ensure their class embarks on a field trip together. As Adachi continues to pursue him relentlessly, Shinagawa's world is further disrupted by a revelation about Adachi's true nature during an encounter with thieves. This discovery plunges Shinagawa into a whirlwind of school adventures, entangled in Adachi's unpredictable and whimsical behaviors.