His wife, Kaori, was not dealt with by her husband and was forced to take care of her bedridden mother-in-law and son-in-law, Kenta. I always secretly enjoyed it with a vibrator in the closet to vent my frustration. One day, Kenta finds it and is raped to make fun of it. After all, the real Sao is better than a toy, and Kaori is addicted to sex with Kenta.