I literally cannot pick a favorite from these, I've gone back through both this and ch5.7 at least twice and I just can't decide.
Smirking Kasumi on p.27 was something else, though. And both of the ones with her mouth covered/tied by the ribbon (with the thorn branches in the ch.5.7 set) are ....well.
I do think Haruyo is the perfect character for goofy doodles like these, though. Whether she's in onee-san mode or "Haru" mode, the simplicity of Igarashi-sensei's depiction of form and especially her expression work for her characters just distills Haruyo to her essence, in the best way.
These are amazing though. Thank you for sharing them - I think this sort of by-volume set like this is perfect in terms of presentation.
I'm just adding to this comment the more I look at these, but Igarashi's insight into the creation of Kasumi, actually getting started as a mangaka, and all of that at the end of this set is really insightful. Kasumi's actual genesis point is very surprising, but I do think it makes sense, pulling from elsewhere in an artist's life and using little tidbits from all over, up to and including random "personal aesthetic preferences" to fuel the creative process is exactly how it goes.
And the whole little thing about finding the "right pen/tool" for the artist - given how much I like her long strokes when it comes to things like Kasumi's hair, I can only imagine how much stress went into finding the best pen for the job.
These really are a little magical to just sit and look at and read through. A peek behind the curtain into the mind of a truly creative individual, and I think the "spirit" of the story and the people she's depicting comes through, whether it's silly, whimsical, or--especially in Kasumi's case--"cute".