Also I'm surprised this was serialized in shonen jump, though I still don't really understand how the genre classifications work
It wasn't serialized in Shonen Jump, but Jump+, the online-only magazine where they run a lot of more experimental / less accessible stories (another notable Jump+ yuri serialization, at least for the last few years: Virgins' Empire). Jump+ is interesting, having serialized a bunch of stuff that I would have guessed was josei or seinen before learning where it was published. Like Comic FUZ or Comic CUNE, its serializations don't neatly fall within demographic lines.
As a heads up, the story has been translated through to the end by an anonymous group and is up over on Mangadex. The translation is pretty rough in places (and I want to know how they got their raws, given all the bizarre artifacts in them) but it does complete the story, and the ending is pretty satisfying (except, as always, it makes me really hungry).
I want more goofy mashups of rando yuri plot with aggressive regional food marketing. Maybe Hiroshima or Kobe? Or Fukushima?