On a daily basis, Naoto Hachiouji endures the unrelenting harassment of Hayase Nagatoro, a rookie student whom he meets while illustrating manga in the library. Captivated by his narrative and observing his unease, Nagatoro designates him as her "Senpai" and takes pleasure in teasing him. Initially, Naoto is disconcerted by Nagatoro's continuous pranks as he feels humiliated by her domination. Nevertheless, as they spend more time together, they gradually form a unique connection, and Naoto discovers that life with Nagatoro can be entertaining. One thing is certain: his days will never be dull again.