Miku is a reliable girl with a tendency to fantasize, while Kanna is a simple Kanna who gets things done when she needs to. They've been best friends since elementary school. They go to the same high school, but Miku Kokoro jealous of Kanna , who gets along well with her new classmates... "Hey, we've always been friends, right? We're special, right? Why don't we make a secret signal just for the two of us?" The answer they came up with was a kiss. Their friendship gradually turns into love... Their relationship escalates into something extremely erotic.