Mao Kurata's husband, Toru, who is 20 years her senior, deeply loves his wife, expressing his affection to an excessive degree. Driven by a desire to protect Mao, what began as a simple signed agreement between them gradually escalated into constant control—phone calls every 30 minutes, restrictions on going out, and eventually installing surveillance cameras throughout their home. One day, when the kitchen drain breaks and they are forced to call in a repairman, the consequences of Toru's obsessive love begin to unravel.