SAN-173 A young wife with large breasts, Hikaru Minazuki, became a wreck both physically and mentally due to being bullied by her in-law who needs care and has a huge dick, leading to neurasthenia.

While desperately enduring abuse from her stubborn father-in-law who requires nursing care, 'Hikaru' continues to provide care. Her husband, unable to defy his own father, ignores the situation and is cold towards his wife. The father-in-law takes advantage of his need for care to treat 'Hikaru' like a toy, molesting her body. Mentally exhausted, she ends up taking an aphrodisiac, straying from the right path, and ultimately becomes a vegetable.