Huh... Didn't expect that... but the touching and cake things made it up to me.
Hm... I am weirdly okay with this development... though I find it completely unrealistic that Yuzu "sees through Mei" in that she immediately gets she was listening to Matsui only for the kid's own sake...
Realizing Matsui set something up? Okay... but correctly deducting Mei's motivation for following through? No way... even with Yuzu by now understanding Mei a bit and Mei behaving a lot nicer...
With the understanding part, I thought it was Yuzu being biased towards Mei and having very lucky dice rolls.
Then again, maybe not...