Raku Ichijo, the son of a yakuza boss, prefers to just live a normal high school life. On the way to school he is kneed in the face by a girl, but gets tended by Kosaki Onodera, a sweet classmate that he has a crush on since middle school. The teacher announces a new transfer student, Chitoge Kirisaki, who happens to be the girl that crashed into Raku, and they start arguing. Raku realizes he has lost his locket that contains the memories of his first love, because of the collision, and asks Chitoge to help look for it. After several days their relationship gets worse that Raku tells Chitoge to stop looking. Chitoge eventually finds the locket. Afterwards, Raku's father tells Raku that he is to pretend being in a dating relationship with a girl from a rival gang in order for their gangs to make peace, but to Raku's chagrin, the girl turns out to be Chitoge.

In order to settle the feud between their families' gangs, Raku and Chitoge act lovey-dovey towards each other. The next day, Chitoge and Raku go on a date, which is heavily supervised by the gangs, but they drive each other nuts on typical activities. At a park, Chitoge heads to a restroom where she overhears her gang acting suspicious over the relationship. Raku wishes he were on a date with Kosaki instead when she suddenly appears. Chitoge returns and tells Kosaki that she and Raku are a couple.

Chitoge's Friend Notebook is helping her make friends. Onodera seems happy that Raku and Chitoge are such a lovey-dovey couple, even though she has feelings for him. Raku can't wait for Onodera to come over to his place for the study group he's having.

A new transfer student arrives at the school. The girls fall in love with him, while the boys can't help having feelings of jealousy. It turns out that the new student is an old friend of Chitoge. Will Raku be able to handle having a rival?

The students are holding their annual Test of Courage. There is a lottery, and the boys and girls are pairing up and holding hands. Raku wants to get paired up with Onodera more than anything, but Chitoge has gone missing in the woods in a ghost costume!

Raku finds the photo that was taken ten years ago. It's the photo of Raku and the girl he made a promise with. The girl turns out to be…

Due to Chitoge's refusal of accepting the role in their play, Kosaki steps in and takes the role as Juliet with Raku as Romeo. Whilst in the midst of rehearsals, Raku and Chitoge gets into a heated argument over their fake relationship. As Raku vehemently states how dysfunctional things are between them and is considering to end their ties, Chitoge slaps Raku out of indignation. On the day of their play, Kosaki gets injured after rescuing a fellow classmate from a fall. With no one else to take over Kosaki in her role as Juliet, Raku approaches Chitoge and convinces her to take the part. After Raku apologizes and admits he doesn't despise Chitoge as the latter had presumed, Chitoge leans unto Raku and accepts the role as his Juliet.

With Chitoge's inclusion into their cast, the play commences with Shu as the narrator taking their performance into a comedic turn, adding nonsensical subplots into the play's story for the enjoyment of the audience but for the chagrin to some of its casts. Nevertheless, the play finishes, gaining warm admiration from the audience while Chitoge recognizes her true love for Raku. With their usual relationship back in place, Chitoge apologizes to Raku for her harsh behavior and adds that she will still be herself in front of him. During a conversation with Kosaki, Raku takes notice of Kosaki's desire of playing the role of Juliet. To compensate for not having played her role, as a result Raku and Kosaki reprise their roles as Romeo and Juliet respectively and did a private play for themselves as Chitoge looks into the horizon and remarks the conclusion of their memorable cultural festival.

Christmas is just around the corner... Shu tells the gang that they should throw a party. However, Chitoge has other plans. Her mom is coming to visit, and Chitoge's dad wants to introduce Raku to her!

Raku is working extra hard as Ms. Hana's secretary in order to give her some time to spend Christmas Eve with Chitoge. However, is Ms. Hana really interested in getting together with her daughter?

Kosaki's younger sister, Haru, finally enters high school. After hearing unsavory rumors about Raku, Haru is none too pleased about him trying to get close to her sister.