From Renta!:

Yoshiki Ikoma is a conscientious salesman with a reputation for getting results. He has a secret passion? Cross-dressing.
Dressing up as a woman and becoming the beautiful Miki is Yoshiki's way of getting rid of his male armor and relieving his daily stress.

One night, he falls asleep in his clothes, sleeps in, and rushes to the office wearing last night's women's lingerie. Despite being determined to keep it a secret, he is soon discovered by his second in command, Subaru. "Oh, my... you look so dreamy-eyed..."