Takeshi and Mizuki have been close friends since high school. They moved to Tokyo together to attend the same university. Takeshi isn't popular with girls, but Mizuki is extremely popular with them, occasionally bringing girls home. One day, Takeshi becomes obsessed with an AV actress named "Natural Beauty Tsukiko" and recommends her to Mizuki. When he wakes up one morning, Mizuki has turned into the AV actress Natural Beauty Tsukiko.
