Ryōsuke Yoshii, an ordinary reseller, carelessly earns grudges by people and becomes entangled in a life-threatening struggle.
A community is shocked when the bodies of an elderly man and the manager of a home-visit nursing centre are found. The passing of 42 elderly patients is connected to Shiba, a caretaker recognised for his affection and dedication.
Kenji and Hitomi Kiyosawa decide to have a smart home built for their family, one which is able to regulate the temperature of the entire house with a single air conditioner unit located in the basement. But shortly after, gruesome incidents start happening in and around the house…
