A year has passed, and Upin and Ipin are now in kindergarten at Tadika Mesra. They have made many new friends but are still up to their mischievous antics with their close friends. Fizi and Upin each bring their own pet spiders for play before class starts but their game is interrupted when Miss Jasmin arrives, before Fizi's spider escapes from under his table. During class, Miss Jasmin informs the kids about the upcoming month of Ramadhan which makes Upin, Ipin and their gang talk animatedly about their previous fasting experience.

Ever wondered when Ramadhan starts? So do Upin and Ipin... Excited about the upcoming Ramadhan, they ask their elder sister Kak Ros, who explains to them that the month starts when the new moon is sighted. Intrigued by this newfound information, the duo set out to look for the new moon together that very night, and of course things do not go according to plan...

Upin and Ipin are performing their fast well, but they wonder why their teacher Miss Jasmin is not fasting. Opah lets Kak Ros explain why women are excepted from fasting. In the evening as they are playing games with their friends, Upin and Ipin are asked by Opah to send food to Tok Dalang. She explains that it is a good deed to give food and alms during Ramadhan. What will Tok Dalang do in return?

Kak Ros membawa Upin & Ipin ke Pasar Ramadan untuk membeli makanan untuk berbuka puasa. Kak Ros memberikan duit kepada adik-beradik kembar itu untuk membeli satu barang sahaja, tetapi mereka terlebih beli ayam goreng sehingga cukup untuk memenuhi meja makan, sehingga setibanya waktu makan, mereka tidak terdaya untuk menghabiskan semua ayam yang dibeli mereka itu.

Upin and Ipin learn about the meaning and significance of Lailatul Qadr from Opah. They decide that they will stay on in the mosque after night prayers to recite the Qur'an and perform supplications instead of playing. On arrival at the mosque, Ehsan and Fizi invites the twins to play firecrackers after the prayers. However, Upin and Ipin stick to their plan and stay on in the mosque. Meanwhile, fireworks explode in the background...

Upin and Ipin's classmates are abuzz over Fizi's bandaged hand. Fizi relates what happened the night before. Miss Jasmin then enters the class and begins a discussion on the reasons and benefits of fasting. The class ends with everyone asking for forgiveness from one another.

With Eid getting closer, Upin and Ipin try to persuade their sister Ros to buy new clothes for them. When Kak Ros refuses to buy new clothes for them, they try to ask from Opah. Opah promises to buy them new clothes. One afternoon, they go out to see their friends. They were excited to see Ehsan's new clothes. Will Upin and Ipin get new clothes this Eid?

Kak Ros and Opah are busy making ketupat and Upin and Ipin offer to help them. They try to weave ketupat but fail. Instead of making traditionally-shaped ketupats, they make unique and weird shapes. Kak Ros scolds them for not being serious about helping her and Opah. Upin finally made a proper ketupat, but the size was too small. When Kak Ros asks him to redo it, they both give up. What will Kak Ros do?

While playing with friends, Upin, Ipin, Fizi, and Ehsan see Ehsan's father and other people pay zakat at the surau. Once they get home, they immediately tell Opah what they saw. Opah suddenly remembered that she has not paid the zakat yet. Upin and Ipin follow Opah to the surau to pay the zakat, but there was no one there anymore. Will they be able to pay the zakat before Eid?

Ramadhan is over, Upin and Ipin are elated that they fasted the whole month this year. Since Tarawih is over, Kak Ros allows them to go out and play with sparklers. While they're playing, they see Fizi and Ehsan with their fathers going to the surau for takbir. They could not follow them because Opah did not go. They continue to play together until Kak Ros calls them for help. They help Kak Ros by preparing the living room for the guests who are coming to perform the Eid takbir.

Eid Morning is the most meaningful day for Upin and Ipin. They both ask forgiveness from Opah and Kak Ros. Later their friends come to visit their house. Opah was impressed when she learns that Mail helps with his parent's business. But Mail will get more good deeds if he fasts the whole month. Mail agrees to fast next year, and apologizes to Opah for charging too much for the lemang he sold. Opah forgives him, and all of them prepare to leave for Tok Dalang's house to deliver rendang.

Upin, Ipin and gang wait for Mail to return from delivering lemang before all of them head to Tok Dalang's house. Mail arrives with his father's huge bicycle. When Upin and Ipin reach Tok Dalang's house, there seems to be no one at home. But when they mention that they are bringing rendang for him, Tok Dalang suddenly appears and invites them to come in. Upin and Ipin's friends all jump out from their hiding places and rush into Tok Dalang's house. Tok Dalang serves them ketupat lembu which is uniquely-shaped and bigger than the usual ketupat.