![NieA Under 7](https://image.chilimovie.com/region2/en/300px/20231109/aINB40Si5rIXVGn8swwtiFM9j0r.jpg)
NieA has been missing for some time now and Mayuko is starting to get worried. Meanwhile life goes on as the owner of the Enohana Bath House is pondering selling out. She tells Mayuko not to worry though since nothing has been decided yet. Mayuko starts to feel nostalgic towards the bath house and her home.
When the restaurant that Mayuko works at gets a large party reservation, Mayuko goes to the supermarket for ingredients. Chie goes with her which turns out to be fortunate since Mayuko has never been inside a supermarket before. After the party leaves the restaurant, Chie sees fireflies for the first time and her father tells he about how Enohana used to be known for them - so to speak. NieA still tries to figure out what the mothership means by the "sayonara" signal she picked up.
Still in the red, the Enohana Bath house must do something to bring in customers. When NieA waltzes in with several parts from a video game store that has closed down, Kotomi (the owner and manager of the bath house) has an idea on how to get more customers. They advertise a game day with the customers playing against the employees - the winner gets a year of free baths.
Mayuko has started a new job at a European restaurant where she delivers food (although she tells Chiaki that she's a waitress). After NieA has stuck Chada with a food bill at the restaurant she works at, Chada pays a visit to the restaurant. Mayuko runs a delivery when Genzo shows up looking for her so that he can give her some rice. When NieA come in, she and Chada start to fight again. What else can go wrong for Mayuko?
Needing to do something to help the bath house get back in the black, Mayuko, Nenji and NieA go to the crater in search of an oil that rumor has it exists there. Along the way, the group are attacked by giant plants and they lose their Bento lunches. When they return, they use the oil for the furnace and mix in some dead plants to cause a nice aroma. All is well until the plants start growing.