From MangaHelpers:

When Toujou Rui was little, she used to wonder why the prince and princess in fairy tales couldn't both be women. Now, Rui's all grown up and starting college. She's moving into her own apartment, eager to meet her own princess and fall in love! The manager of her new apartment building, Suou Hina, is absolutely adorable and Rui can't wait to get to know her better!

However, her new apartment building hides a secret. Portals to the land of fairy tales open through the closets, and Hina is one of the people tasked with managing these portals and the fairytale denizens that travel through them. Hina also seems to have a secret of her own... Will Rui be able to navigate this strange, new world, and also find some way to win Hina's heart? [tethysdust]