I'm a humble office worker who is obsessed with my wife and children. Even though it was my birthday today, my family went on a trip and left me behind. Even though I'm such an old man, I wanted someone to congratulate me. So I called a delivery health service for the first time in my life. That's where I met Rin. I wonder why such a cute girl is doing sex work...When I realized that, I was thinking about her all the time...I fell in love with her despite my age.