Mimori recalls the events of the Yuki Yuna Chapter, in which she once again became a hero and fought alongside Yuna and her friends as a member of the Hero Club.

A group of pure young girls gathers from various eras at the club room of the Hero Club in Sanshu Middle School in Kagawa with a duty to protect the peace. One day, the club president, Fu, told them that they will come together to make a special udon. Utano suggested Shinshu soba to be best suited as the Hero Club Udon and riled up Fu.

In order to set an example for everyone, the original Hero Club started making a trial udon. Since there are two members who are good at cooking, they were laughing at the easy idea that they would be able to complete the "Hero Club Udon" today, but then the.... incident happened.

The three Yunas worked hard to make udon noodles. However, perhaps they put too much effort into it, and the dough turned out to be harder than expected. With their motto of "act quickly, don't think", the three Yunas get out of the jam by using the only means available to them.

Wakaba and Tamako were feeling like udon after entering the hot springs. What is Udon? While Wakaba is searching for the direction of Hero Club Udon, Tamako is doing the opposite. That is because there are tall mountains in front of her eyes!

A sleepover party for the younger group, consisting of elementary school students and junior high school students. The topic of discussion was how to make the best udon. They discuss various opinions such as what should be tasty, what should look good, etc., and finally complete the best udon ......?

In the Divine Era, when Shikoku became the world, udon is the staple food and the national dish. However, among the Heroes summoned from all over Japan in the past, there were definitely those who favored soba and ramen. There is no way that this will not cause conflict. ......

Mebuki Kusunoki, the commander of the Sentinels, does not have great cooking skills. However, with the help of her friends, she realises that there is something that only she can do. She must be a great member of the Hero Club!

There are Mikos who belong to the Hero Club. They, too, have been struggling with the development of udon for the Hero Club. Using their ability to obtain oracles from Shinju-sama, the god of this world, they try to come up with a supreme udon, but then a helper intervenes!

In the Hero Club where all the innocent girls are gathered, there is a Hero, Chikage Koori who is aware of her own distortion. The only thing that saved her from being distorted by her harsh upbringing was a simple call and a pair of straight eyes. That's all it took.

A member of the Hero Club accidentally drops "something" into the spring. What they have in common leads to a fantastic chaos. It is a fairy tale, a violence, and a mysterious event full of mysteries.

Kokubou Kamen (masked defenders of the country) are trying to develop Udon with a firm idea. However, what stands in front of them, who aim at frugality and simplicity, is that dark heroine who is gorgeous, selfish, and irreverent, and who is always ready to chomechome

The time has finally come for a verdict. But they can't decide on a dish that has no definition and is vague to begin with. What is the right kind of udon for the "Hero Club Udon"? Will the Heroes be able to settle this difficult question?