One day, Nashiko Jippensha is kicked out of the house by her mother for making too much noise in her room. Having lost her place to party freely, Nashiko receives a call from her father telling her that she can use the old mahjong hall he used to run as she pleases in exchange for cleaning the place up. She immediately starts cleaning and then, a mysterious spirit appears from the store's mahjong tiles...?!

Riche finds Nashiko at the mahjong club, as she promised, and manages to convince her to let her join the group of friends. She also meets Pai, Izumi and Chombo and, around the mahjong table, a new friendship is created.

Now that the four friends know that the stove works, the next step is obvious: prepare a good dish! On the menu, a delicious curry accompanied by sashimi and ice cream for dessert. But before that, they start putting the old mahjong club in order.

Nashiko finds herself without internet on her cell phone after using up all her mobile data. So, she contacts her father asking for Wi-Fi to be installed in the store. With the Wi-Fi working, on Riche's recommendation, the girls decide to play mahjong online.

Riche defeated a strong opponent she met in an online mahjong game. While they were in a celebratory mood, their opponent in question, Emi Haneru, arrives. Immediately upon arriving, Nashiko is initially impressed to see her requesting a rematch with Riche. However, after hearing the words of Riche and her friends, she is inspired. Later, to deepen their friendship with the girl, the group begins a certain strategy...

Mahjong fans organize a one-night stay at an inn in Onomichi to... play mahjong. They also take the opportunity to visit tourist sites in the city that they normally don't have the opportunity to see. Haneru only hopes for one thing: to finally confront Riche and get revenge.

August 1st is "Mahjong Day". On this day, Pai celebrates her birthday, so Nashiko throws a birthday party for her on the beach. The group enjoys a unique birthday party, eating birthday cake on the beach in the middle of the day and playing in the sea. Later, as the party approaches its final stage, Nashiko and the others decide to give Pai a gift. However, right away, Riche presents her with something too expensive to be a gift...

Nashiko's mother invites her to help produce 3,000 paper lamps for the festival of lights, but with only 4 days available she will have to resort to the indispensable help of her friends.