^There are chapters without that stuff but with some comedy that i wouldnt call relationship chapters.
The only chapters i can think of off hand that would qualify for that would be 64 when she is taking care of the sick Hino, and some early chapters like 8- and 24 for sure. Then 10 and 63 and 25 nearly count too- maybe a few more..
So yeah- this chapter isnt the 1st like this.
Well, I almost, and should have, added "misunderstanding the other's feelings" to the "dismissing their own feelings" part, which would knock out Chapter 8, and 10 has the "joke" about couples under the umbrella.
But you're right about 24, 63 & 64 (although in 63 it feels like a gag when Hino passes out after Koguma blows on her spoonful of porridge).
I don't mean to quibble about this; it's just that to me this really did feel like the first chapter that could have come out of a straight (in genre terms) romance story, without a gag or boke-tsukkomi exchange hovering in the background (maybe, as Zormau suggests, because the whole thing takes place in public).
A lovely chapter, in any case, and let's give it up for our courageous Little Bear.