When Naoto Hachiouji, a diligent manga artist, encounters the mischievous Hayase Nagatoro in the library, his days take a peculiar turn. Nagatoro, intrigued by his work and demeanor, adopts the role of Senpai and playfully teases him incessantly. Initially flustered and coerced into various activities, Naoto gradually discovers a unique bond forming amidst the teasing. As their time together unfolds, what started as discomfort evolves into an unexpected friendship, filled with moments of joy and amusement. With Nagatoro by his side, Naoto's life brims with unpredictability and excitement, promising that monotony is a thing of the past.