Simple Mina (Yui Miho) devotedly cares for her father-in-law who has dementia. She doubles her memory with her deceased wife and is sexually assaulted by her. One day, her father-in-law, who gets angry at her clumsiness, pushes aside Mina's resistance and forcibly enters into a relationship. From that day on, she was forced to turn into a libido helper who offered her body...
