I was expecting this to be a sequel, but it wasn't. It takes place before Godai and Kyouko get married, which means they have two options: they can fill in some of the year that got skipped before the wedding or they can do something immediately before the wedding. They do the latter; this is about one of the final (well, "final") parties at Maison Ikkoku before they tie the knot, and so it's a bottle episode with a ton of food porn. I'm here for it.
This is one of those movies that make you go "wow, it really is possible to make a good looking movie out of anything." Even though not a ton happens, there are still setups and payoffs throughout, small conflicts, and interesting camera movements. It keeps your mind engaged while letting the animators show off a bit, and it's always elevating otherwise trivial moments. I don't feel right picking out just one because it really was a constant stream, but the scene where Yagami and Kyouko talk in the attic was lovely. They could have just said what they needed to say to each other and moved on, but no. Yagami had to go to the bathroom, so she ran downstairs and interacted with Yotsuya. Then, when she came back, she decided to jump over the stairwell and almost fell because she was drunk. When Yagami confronted Kyouko, Kyouko swung her legs out over the stairwell, and jumped down when she was finished. Then Yagami yells after her and hangs her head down into the stairwell to look after her. And all of this times well with the theme of their conversation, where they are in relation to each other and with Godai. It's a very dynamic, beautiful movie.
The series itself is a strong 9 and this, due to its scope limitations, is a bit of a downgrade in the story department, but it maintains the show's delightful atmosphere. It sparks such joy.