Usami-san wa Kamawaretai! - Vol. 4 Ch. 64 - It's finally time for the exam results!

[Ezlsnow]

Why was usami's mother shy when kids asked her for a gift?

From the previous chapter, 63? I think she's just drunk like the other parents, and the twins were waiting for that moment (there's the speech bubble with "Now!" written) before shamelessly asking for their New Years gifts.