Wife 'Nanako' and husband 'Ryo', along with their friend 'Tooru', have been close since their university days, able to talk about anything. Neither Nanako nor Tooru had ever seen each other as the opposite sex. One day... Ryo was late from work, so Tooru took out hemp rope and a beginner's book he bought for his younger girlfriend and started tying up Nanako for practice. ＜Emphasized chest＞＜Exposed thighs＞Tooru's gaze towards Nanako gradually turned into one that sees her as a woman…
