Matoyo Yuji, a overworked office worker, encounters his neighbor, Saotome Mio, who is locked out of her apartment late one night. After helping her, his casual "Welcome home" deeply touches Mio, a successful businesswoman who struggles with social interaction. Mio, touched by his kindness and recognizing his difficult work environment, offers him a job: to say "Welcome home" to her every day for 300,000 yen a month. This unusual employment agreement blossoms into a heartwarming tale of connection and unexpected romance.