Kuzuu, who teaches Cosmetic Science at university, is asked by his student, the famed 'cool beauty' Shiomoto, to help with an experiment involving male hormones by doing XXX. Telling himself it's for research and for his cute student, he reluctantly agrees… but Shiomoto's demands grow more intense with each passing day... The more he thinks "No, we can't, we shouldn't", the more unstoppable it becomes! This research is downright addictive?! A problematic experiment begins between a natural airhead and a tsundere beauty!