The story of Ran, the older twin sister of the Shiraishi family. Ran is proactive and has the ability to take action. She asks you to teach her studies so that she can do naughty things with her beloved brother. Even though she knows that her brother should not fall for her trap, she falls in love with Ran...and her younger sister, Non, finds out about it, leading to the sequel, "The Shiraishi Family's Twin Sisters, Non-chan." …
