1) The Invisible Key Moriyasu sells medical equipment, but has a problem with hospitals. The handsome doctor, Nobuaki, likes to tease Moriyasu when he sees him, because the good doctor suspects that Moriyasu's problem might not be so bad... 2) The Invisible Chain 3) Spoilt and Selfish 4) Tracing Fingertips 5) Sweet Markings 6) Sweet Bonds 7) Don't Just Torture Me Gently 8) Unwavering Control (Source: MU)