Seems to be related to Hishimi's christmas event in her campaign, where she supposed to have a "normal" x-mas party with her friends, but her friends didn't show up leaving Hishimi and her trainer to enjoy it by themselves...
This might be a good explanation lol
......Well, want to get something to eat?......!?
I-is that alright?Wah~
Thank you so much!Trainer-san let's go eat chicken! Fried chicken!Ah, sounds good to me