The episode opens with a scene of [[Haru Miura]] running out of her house and walking on a fence. While on it, she bumps into [[Reborn]] and [[Tsunayoshi Sawada|Tsuna]] while they are on their way to school. She is delighted to know that Reborn remembers her from before and asks him to be her friend. When he accepts, she jumps down acrobatically from the fence and asks him for a hug. He refuses and takes out the transformed [[Leon]], saying that hitmen didn't perform those actions. At this, Haru hits Tsuna because she thinks that he is the one who influenced Reborn to say those things. While in anger at Tsuna, [[Lambo]] comes flying out of nowhere and lands on his face. As Haru comforts him, she notices Reborn and Tsuna running away, and says that they will continue this battle later.

The episode opens with a scene of [[Haru Miura]] running out of her house and walking on a fence. While on it, she bumps into [[Reborn]] and [[Tsunayoshi Sawada|Tsuna]] while they are on their way to school. She is delighted to know that Reborn remembers her from before and asks him to be her friend. When he accepts, she jumps down acrobatically from the fence and asks him for a hug. He refuses and takes out the transformed [[Leon]], saying that hitmen didn't perform those actions. At this, Haru hits Tsuna because she thinks that he is the one who influenced Reborn to say those things. While in anger at Tsuna, [[Lambo]] comes flying out of nowhere and lands on his face. As Haru comforts him, she notices Reborn and Tsuna running away, and says that they will continue this battle later.

Inside, they have finished almost all the questions. Haru tries to go in, but is stopped by [[Nana Sawada]] before she can open the door. After saying that she was Reborn's friend, Nana welcomes her in. In Tsuna's room, they have finished the entire worksheet, with the exception of question seven. None of them are able to solve the question, but Yamamoto notices that Haru is wearing the uniform of Midori Middle School, an elite girls' school. However, Haru cannot solve the problem either, even after taking nearly the entire day. She tries to invite [[Bianchi]] in, but Gokudera prevents that from happening. Bianchi melts the door with her [[Poison Cooking]], but instead of attempting to solve the problem, she rips Tsuna's paper to shreds. Haru then remembers that [[Haruyoshi Miura|her father]] is a mathematics professor, and invites him to try the problem. However, he says that the question is unsolvable. Reborn then wakes up and says the correct answer, and Mr. Miura recognizes Reborn as Professor Boreen, a mathematics genius.

Inside, they have finished almost all the questions. Haru tries to go in, but is stopped by [[Nana Sawada]] before she can open the door. After saying that she was Reborn's friend, Nana welcomes her in. In Tsuna's room, they have finished the entire worksheet, with the exception of question seven. None of them are able to solve the question, but Yamamoto notices that Haru is wearing the uniform of Midori Middle School, an elite girls' school. However, Haru cannot solve the problem either, even after taking nearly the entire day. She tries to invite [[Bianchi]] in, but Gokudera prevents that from happening. Bianchi melts the door with her [[Poison Cooking]], but instead of attempting to solve the problem, she rips Tsuna's paper to shreds. Haru then remembers that [[Haruyoshi Miura|her father]] is a mathematics professor, and invites him to try the problem. However, he says that the question is unsolvable. Reborn then wakes up and says the correct answer, and Mr. Miura recognizes Reborn as Professor Boreen, a mathematics genius.