I really like the pacing and the few things Ohsawa Yayoi chooses to focus on in this short series. So far there's virtually nothing else besides Morikawa being completely enraptured by Sensei, meaning that the author can take her sweet time portraying it without being shallow. I could re-read it lots of times, honestly!
Plus, there's the absolutely perfect clumsy adult/hard-working youngster dynamic.