According to Nicopedia it's about Ritsuko, which fits the timing and characters involved.
heave ohperfect!!Let's wait a bit more.Cinderella Girls Theater
あの人のために / For that personHey, can I have some snacks?Who do you think this party is for?Uuuuh...gra
Um, they're cute.
What do you think about these decora- tions?
I wonder if she'll be happy about this surprise...I've even prepared some new clothing!She'll be surprised for sure!She's working overtime, so she'll be late...Con