Tis is definitely the type of manga, in which an entire chapter can raise a random topic, like: "What are potatoes?" and then have a self-contained lesson about it, by having the MC, out-of-the-blue, meet potato farmers and potato chefs.
Rarely do manga these days actually go with that sort of a story-structure, in which every chapter is: "I have a problem -> Other people have this problem -> You know, I learnt something today."
Feels terribly nostalgic, or "old-fashioned writing / editing", but I can't say I miss it.