FuKu

FuKu is the het ship between Fuutarou Uesugi and Miku Nakano from The Quintessential Quintuplets fandom.

Canon
The relationship between Futaro and Miku does not start in the best way, since she meets him for the first time and during the first chapters she does not participate in his lessons, remaining distrustful of him. It improves when the two of them have an argument where Futaro shows her and his sisters potential, since then she starts attending Futaro's classes.

Her feelings for him are clear ever since Yotsuba asks her if she loves Futaro. Miku even goes as far as cooking in a contest against Nino despite having no skill at all, when later Futaro tries both dishes saying they are good both good, making Miku happy. During the summer festival two girls ask Futaro and Miku if they are a couple, and Miku is upset for a moment when Futaro says they are just acquaintances.

Before the school trip, in which there will be a dance, Ichika asked Miku to pretend to be her to reject a person, accidentally Miku says that she would go with Futaro.Later in the field trip, Futaro and Miku while hiding from Yotsuba have a conversation that improves their relationship. Furthermore Miku worries about him when he's not feeling well.

During the Seven Goodbyes Arc the only interaction between the two was searching for Nino together. At the end of this story arc, she is left speechless when she learns that Futaro will no longer be their teacher. Miku is also the only one who asks if Futaro is okay after falling into the river.

In this period of interlude between the two arcs Miku is the only one who prepares chocolate for Futaro even though she hates it and has no cooking skills. This shows her determination towards him.

The Scrambled Eggs arc is one of the defining arcs for their relationship. She initially wanted to make Futaro quit his job as a teacher to no longer be seen by him as a student but as a girl. Being that all the sisters were dressed as Itsuki for Futaro it became a manhunt, in which he has a conversation with the grandfather of the twins, where he asks to learn how to recognize them, the old man replies only with the word "love". At the end of the arc he manages to have a conversation with Miku, and as she was about to leave after Futaro was wrong for the umpteenth time to recognize them, he has a feeling that the girl is not Ichika as he originally stated, but Miku, so she becomes the first one that Futaro can recognize. During her subsequent conversation with him, Miku has an introspective where she says things are fine the way they are for now.

[Continue]

Fanon
The ship FuKu has always been the most supported by the fandom, the fans are also characterized by the rivalry with FuNino, being that in the series there is a clear rivalry between Miku and Nino. Another characteristic is the hatred for Ichika after his behavior towards Miku before and during the school trip. The fandom took the end of the work badly, to such an extent that works were born that had the intention of correcting the ending with Miku as the winner. A similar thing happened in the Nino fandom.