It's funny because at the start of the manga it was clear that the dynamic was supposed to be "the two leads actually do like each other romantically and are a serious couple, they're just hung up over their breakups to acknowledge it".
But at a certain point it seems like the author pivoted...
I mean, how do you even top this? It's what the manga has spent all its years building to and changes everything. Plus Nishi's dedicated to Ichi the Witch for the long term so that's another factor.
Some fun callbacks this chapter
Ichi walks by all their old spots
Says goodbye to Nigorikawa on the blackboard
Chi does her praying mantis impression that Yamada finds hilarious
Anna holds her head up to avoid crying, just like in chapter one
It's funny that as utterly ridiculous this all is, the fact that we're still dealing with the same cast and conflict from the first chapters make it more consistent than some manga
More like there was no way a drama would actually have a middle schooler have a kiss scene with her adult co-star so it wasn't really a logical conflict.