Jiro is usually the name of the 2nd child in the house.
'Mi' in Miku can mean '3' according to goroawase.
That means there's an unseen eldest son/daughter in Maekawa household 🤔
(please ignore this it has nothing to do with the chapter. Move along)
It's funny how changing the producer's gender allowed them to add more depths to her personality and backstory
I'm kinda mad that we never knew more about TakeP and his past
Also Spark Maiden is not unseen anymore
Apparently the top left girl is a member called "Ruru-chan" (Arisa's main oshi who was having a graduation live, that's why Arisa looked so distraught in this card)