On my birthday, my wife and kids left me alone to go on vacation without even wishing me a happy one. As a pathetic salaryman, all I wanted was someone to celebrate with. So, I decided to try out a delivery health service for the first time in my life. That's when I met 'Rin'. How could such a cute girl be working in that industry? Before I knew it, I couldn't stop thinking about her... and ended up falling hopelessly in love.