Yoru and Asahi are two sisters who run a cozy café together. They have two friends, Shiro and Kohei, who also work there part-time. During the day, they live a peaceful life, but at night, they have another job. Their nighttime job involves battling dream demons that possess people. They call themselves the Night Tail. But here’s the twist: even in their own dreams, these girls get a little bit naughty. They do some erotic things like tasting a stranger’s penis and experiencing new and exciting encounters. No one knows about the secret of them. The sisters transform into a magical girls-like and battle the dream demons in a lewd way.