Upon returning from school one day, Ohana Matsumae learns that her mother is going on a moonlight flit with her boyfriend to escape from debt and they are sending her to live at her estranged grandmother's hot spring inn in the country. When her best friend, Kōichi Tanemura, hears of this, he confesses his love for Ohana before running off, not seeing her off when she leaves. As Ohana arrives at the Kissuisō inn, she makes a bad first impression with one of the employees, Minko Tsurugi, before being informed by her grandmother, Sui Sujima, that she is to work at the inn to earn her keep. She is shown around the inn by the head mistress, Tomoe Wajima, and another employee, Nako Oshimizu. When Ohana notices the hard work Minko has to do, she tries to do something nice for her by airing out her futon, but it ends up falling off a window and landing near some customers. As Minko is slapped by Sui for Ohana's mistake, Ohana demands to slapped even harder, though Minko doesn't particularly thank her for it.

The staff members of Kissuisō wait and try to mentally prepare for Satsuki's arrival. Sui places Nako in charge of taking care of Satsuki, while the others speculate on whether or not that is a good idea. Arriving, Satsuki comments on how the inn hasn't changed at all from her years as a child, and criticizes constantly on how everything is done. However, Sui states that, in order to properly satisfy a customer that one must observe them on their first stay to see what that customer prefers, adding that even though it is Satsuki's first stay in the inn, it is not her first time being there. Sui and Ohana work together to make a list of what Satsuki likes. After a night of drinking, Satsuki, Ohana, and Sui all begin to understand each other a little better, and Satsuki leaves the next morning after writing a new, positive and praising review of Kissuisō. Ohana sorts out her feelings about Ko and, after a tearful realization, shouts her thanks to him for watching over her and says her farewells.

The inn becomes troubled over becoming shorthanded, but reject Ohana's offer to help out. However, she feels she needs to do something and, after the inn becomes unable to find replacement waitresses, they accept Ohana's help, with Minko and Nako deciding to help her out as well. However, the robotic system that assists with dishes breaks down, so Ohana suggests that they send the customers to have a bath before dinner to give them extra time to set up the tables. As Ohana and the others work on the tables, getting help from the other students, Yuina visits Yosuke and, after hearing that he might want to marry someone like Ohana, decides to break her habit of not working and help him clean the baths. After dinner, Yosuke allows the girls to use the hot springs. As the field trip comes to an end, Yosuke decides to rethink his training whilst Yuina decides to work harder herself.

It's the day before the school festival so Minko wakes early, buys the ingredients, and starts prepping with the unwanted help of Ohana. When Nako asks to have omelette rice for lunch, Minko, unfazed, makes a perfect omelette rice dish. Adding Ohana's twist to the dish, they decide to also serve it on the menu of Class 2-A's princess cafe. Tōru arrives and Minko adds a big ketchup heart around his omelette rice. After they see from the class building that the campfire was lit, Minko, Ohana, Yuina, Nako, and her classmate decide to go down and take a look.

With the growing number of reservations, Ohana grows concerned about the changes Kissuiso is making and the lack of sleep the employees are getting. She is also finds herself at odds with some of the others for siding with Sui. Ohana tells Nako about what Sui told her, who tells her why her opinion differs. Things turn bad for the Kissuiso when Tomoe sprains her ankle on the day before the festival, but Sui and Satsuki arrive to fill in as waitresses and together they manage to make it through the day of the festival. Afterwards, everyone goes to the Bonbori festival.

As everyone explores the Bonbori festival, Ohana, who now dreams of being just like Sui goes to meet up with Kō, finally confessing her feelings for him. After the festival, a farewell party is held for Denryoku, where Enishi announces that he agrees to the Kissuiso being shut down until he feels he is talented enough to run it properly. As the Kissuiso closes down the next day and everyone parts ways, Sui sees off Ohana, who promises to return someday, giving her Denryoku's log as a keepsake.