nah I think it's on purpose, it's the artist's way of showing she's getting all meek when he points out she sucks at horror so she's just being a bit bashful.
HEY AUTHOR YOU CAN'T JUST TEASE THE GLASSES AND NOT SHOW ANYTHING! I WANNA SEE MALE TACHIBANA IN A MAID DRESS TOO GOD DAMNIT!
That's probably just the author's wishful thinking, but I hope this gets a second season too, first one was great!
damn the story just got a whole new magnitude bigger out of nowhere, I hope this doesn't mean the manga is approaching the axe like this authors other stuff