At Bonyari High School, Raku Ichijou, the heir to a yakuza clan, clings to a childhood vow represented by a pendant and a missing key. As he navigates high school life with his crush, Kosaki Onodera, a gang clash thrusts him into a fake romance with Chitoge Kirisaki, sparking instant mutual loathing. Struggling to keep the peace between their families, the pair embarks on a turbulent journey filled with unexpected surprises and a growing entanglement of girls tied to Raku's past.