Was it a little excessive to have *two* costumes for Halloween? Maybe, but when you got to Ayame’s age, you had fun wherever you could. In this case, wearing a generic angel costume during the day, and changing into a plague doctor costume at night. The latter of course she hoped to use to troll people a little bit. Scaring people on Halloween was part of the fun. Besides, what couple didn’t like a little scare to send them into the arms of their beloved? Or their crush, if they hadn’t gotten to that couple stage yet?
It wasn’t like she had anyone to attend a party with, so she would do her best to have a little bit of fun this year. Besides, it wasn’t like anyone would recognize her with that huge mask on anyway. And if it was too scary, she would just make sure to stash her original costume somewhere, in case she needed to change in a hurry.