In his youth, Raku Ichijou made a sincere vow to his childhood friend that they would wed if they ever crossed paths again. A decade has elapsed since that pivotal moment, causing Raku's recollection of her to fade. Yet, he retains a token of their bond—a locked pendant, for which his childhood friend possesses the key. He harbors the hope of reuniting with her someday, even though he cannot recall her appearance. Currently a first-year student at Bonyari High School, Raku strives for an ordinary existence, aspiring to become a civil servant and marry his crush, Kosaki Onodera. This goal proves difficult, as he is the reluctant heir to a major yakuza clan, and Raku cannot evade his obligations when the American Bee Hive gang initiates conflict over his family's territory. To establish peace between the two hostile groups, Raku is compelled into a sham romantic involvement with Chitoge Kirisaki, the attractive daughter of the Bee Hive's boss. The pair rapidly develop mutual animosity, yet they must learn to cohabit and feign deep affection to keep their families appeased. Nevertheless, Raku's search for the pendant's key grows more complex as additional girls—who all have some connection to the pendant—enter his life. Follow Raku as he manages his fictitious relationship, sustains the equilibrium between the warring clans, and uncovers the identity of the girl who will unlock his heart.