@Thrembs
"It’s all over the place"
The focus has stayed primarily with Shun and Mio's relationship and Fumi's infatuation him Sakurago has been a recurring plot point since the first volume. Thematically, I'de say it's been pretty consistent with exploring concepts of non-traditional families and relationships (a least in a Japenese context).
So far the series has explored the relationships between a gay couple, an adopted brother, a breadwinner mother and stay-at-home stepfather, and now a middle schooler infatuated with a women in her 30's.
"everything is zany and extreme, now,"
things have always been zany and extreme, even in the prequel. Did you forget that Sakurago actually tried to stab Shun without any legitimate provocation in the prequel? Or that Mio shows up after 3 years of no communication and pledge his undying love to Shun, a guy he new for maybe a few days at best? Seriously, what is in the sequel tonally that sets it apart from the pequel in any meaningful way?