Wakeari Danjo no Secret Days

Akari is a 25-year-old bookstore worker who lives in Tokyo. She looks like a very normal and stylish office worker, but she has a secret she doesn't want anyone to know: she is a massive otaku for 2.5D stage play actors, to the point that she spends all of her paycheck immediately to support them. She desperately hides this, but somehow her male coworker finds out her secret anyway.