The protagonist of the hentai, Itsuki Watase, unexpectedly gets a new mother and two sexy sisters Nagisa and Fuka. All because his father decided to remarry in his old age. At first Isuki and his new family build a close friendly relationship, but in time our hero begins to understand the beauty of close contact with three sexy girls in the same house. Our hero's lust is keeping him awake and driving him crazy. One night he finds his step-mother Watase Otohu dozing on the couch. Itzuki decided to molest her and enjoy her seductive mature body. Soon the hero decides to completely subjugate the two sisters as well, to create his own personal mini harem...