Раку Итидзё, сын босса якудза, предпочитает вести обычную школьную жизнь. По дороге в школу он получает коленом по лицу от пробегающей девушки. За ним ухаживает Косаки Онодера, милая одноклассница, в которую Раку влюблен со средней школы. Учитель объявляет о новой переводной ученице, Читоге Кирисаки, которая оказалась девушкой, которая врезалась в Раку, и они начинают спорить. Раку понимает, что из-за столкновения потерял свой медальон, в котором хранятся воспоминания о его первой любви, и просит Читоге помочь найти его. Через несколько дней их отношения ухудшаются, Раку говорит Читоге перестать искать. Читоге в конце концов находит медальон. После этого отец Раку говорит Раку, что он должен притвориться, что находится в отношениях с одной девушкой из конкурирующей банды, чтобы их банды помирились, но, к огорчению Раку, эта девушка оказывается Читоге.

Чтобы уладить вражду между бандами своих семей, Раку и Читоге относятся друг к другу с любовью. На следующий день Читоге и Раку идут на свидание, за которым тщательно следят банды. В парке Читоге направляется в туалет, где слышит, как ее банда подозрительно относится к их отношениям. Раку хотел бы быть на свидании с Косаки, когда она внезапно появляется. Читоге возвращается и говорит Косаки, что они встречаются с Раку.

Raku wants to talk to Kosaki and explain to her that he’s not going out with Chitoge. All the other students are very curios about Raku and Chitoge's relationship, while Claude is still suspicious of what is going on. Raku finally decides to consult Shu.

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.

Ruri talks to Onodera about her feelings for Raku and the promise she made ten years ago. Ruri asks Chitoge to join the girls' swim team and invites Raku, Chitoge and Onodera to the swimming practice, in hopes of investigating their true feelings.

Chitoge faces surprising difficulties in her attempts to thank Raku for rescuing her. After discovering the true nature of Chitoge and Raku’s relationship, Onodera tries to muster up the courage to confess her true feelings for Raku.

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?

Claude is training Tsugumi for her mission of finding out the truth about the relationship between Raku and Chitoge. Tsugumi is going through some changes, and she seeks advice from people around her. Could it be possible that she is in love?

While on an open-air school trip, Raku mistakenly ends up in the women's hot spring. When his female classmates show up to bathe, he must try and find a way to escape before being caught and labelled as a peeping tom.

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!

It's Chitoge's birthday. Seishirou is planning a surprise party for her, and she invites all her friends. Raku and Onodera go out together to get birthday presents for Chitoge. But are they on a date now?

Chitoge tells Raku about the boy she made a promise with ten years ago. Raku admits that he, too, made a promise with a girl ten years ago. They decide to try and see if Chitoge's key would open up Raku's locket. But…

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…

Raku's dad gives Raku the news that he actually has a fiancée and that she is coming to see him . He wants Raku to entertain her. She is the girl from the photo taken ten years ago!

Marika explains to Raku how they first met. He tries to remember the details, but it's hard for him. She takes him to her home to meet her father. Raku wants to call off the engagement, but he is so scared of Marika's father!

Onodera asks Raku if he could take on a part-time job at her family's Japanese Sweets shop. He agrees, not wanting to miss the chance of seeing her. A storm breaks out, and now Raku has no choice but to stay at Onodera's home with no one else around. And…

Raku runs into Chitoge at the festival. Seeing that many things come free when she is with Raku, Chitoge decides to hang out with him. However, there is only one thing on Raku's mind… To purchase a romantic relationship charm!

The gang goes down to the beach to enjoy the last days of summer. Chitoge starts acting very strange after seeing Raku with Marika and Onodera. Is she starting to realize she is actually in love with Raku?

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.