ランジェリーズ

The main character, Aoi Miyamae, is a male university student.

Aoi's twin sister, Riko Miyamae, has a different gender from Aoi, but they are identical in appearance and facial features.

Riko works as a clerk at 'LingerieS', a high-end women's lingerie specialty store. However, she wants to take two months off from her job to catch up with her favorite band on their national tour. However, she can't afford to miss work.

So, Riko asks Aoi, who looks exactly like her, to dress up as a woman and work at 'LingerieS' instead of her.