The high school student Ichijou Raku is the son of a leader in the yakuza faction Shuei-Gumi, and Kirisaki Chitoge is the daughter of a boss in a rival gang known as Beehive. They unexpectedly meet when Chitoge hops a wall and knees Raku in the face. After she runs off, Raku realizes he has lost his pendant which was given to him by his childhood sweetheart with whom he made a secret promise. After discovering Chitoge is a new transfer student in his class, he forces her to help him look for the pendant. During the search, they begin to dislike each other.

Upon returning home, Raku learns that the Shuei-Gumi and Beehive gangs have agreed to settle their feud by pairing their leaders' children, and that his girlfriend-to-be is none other than Chitoge. For the next three years, they must pretend to be in a relationship to maintain peace between the gangs. This turns out to be quite a challenging task, not only because of their hatred for one another, but also because Raku has a crush on another schoolmate, Onodera Kosaki, whom he secretly wishes was the girl who bears the key to his pendant. Various developments complicate the situation, including Chitoge's over-protective bodyguard, a female hit man, a girl who claims to be Raku's fiancée, and the existence of multiple keys.

Source: Wikipedia

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Sequel: Nisekoi:
Alternative setting: Nisekoi: (2016)