Anti-social people hater, Kokuyou is always going in and out of the hospital. Unable to stand it any longer, his friend Seiki gives him a "replica," a boy android named Shiro who can monitor his health and do chores. At first, Kokuyou can't hide his irritation toward the bumbling Shiro, but will Shiro's puppy-like devotion and dogged perseverance be able to win Kokuyou over in the end?