I Get So Upset At The Gege Forgot Gege Is Just Making Stuff Up To Satisfy A Subreddit Narratives They're So Tired And Wrong Ajchamxkcjak - Tumblr Posts

We knew that Mei Mei was up to something this whole time. Please let's not pretend this new shadow school stuff was out of nowhere.

Chapter 244 - middle of the Higuruma fight. Mei Mei is talking to someone unidentified on the phone informing them about the state of the fight.

Chapter 258 - In the middle of the planning session Hakari asks about the binding vow regarding Simple domains.

So I assume the murder of that woman who was the head of the Shadow style house happened before the Gojo vs Sukuna fight began. And we only learn about it now, which is typical style of storytelling for jjk.

And after Mei Mei is doing her standard Mei Mei thing which is finding ways to gain something for herself. We yet don't know with whom she was talking on the phone in chapter 244 but since she learned that shadow school info was from Tengen.... I don't know. I'm just saying this upfront that we will see more Mei Mei action.

And the shadow school stuff was always there!