Wife-in-law lesbian training

Maki, a new wife, falls in love with Takashi Iori, a colleague at work, and marries into the Iori family. Although she had a good relationship with her mother-in-law, Ryoko, she felt uneasy about the fact that she didn't spend time with Tsutaka at night. However, there is no way to know that this is Takashi and Ryoko's plan... One day, Takashi is away from home on a business trip, and ends up spending time alone with Ryoko. From that day on, Ryoko begins to provide her with an insidious and persistent education called ``Bride Training'', and Maki learns the true meaning behind this marriage...