Based on the erotic game by Noesis.<br> <br> A kind and reliable older sister, Mizushiro Ayaka.<br> A younger childhood friend and now my girlfriend, Tsurutani Ayaka.<br> While I'm happily getting along with the two, I wasn't satisfied. That is because I have a hobby that I cannot let surface.<br> <br> I want to do, S&M.<br> <br> I sneakily buy tools for my personal use, stare at them, touch them. One day as I was expelling myself of my urges, I noticed that someone had entered my room, and closed on to that secret.<br> <br> "Let's try setting a trap"<br> <br> I expose who discovered that secret. And so, our abnormal relationship began.<br> <br> (Source: Noesis Homepage)