10 years ago, Nakahara Asami's parents died in a car accident, leaving her an orphan. Ever since then, a mysterious guardian named "Ashinaga Ojisan" ("Daddy Long-Legs") has taken care of her education and finances on the condition that she work hard at school to become a doctor like her parents and that she never ask about his identity. This year, she is starting her first year at medical school. While adjusting to her new and separate life from her boyfriend Katsumi, she meets classmate Moritsugu Shun and a handsome new professor named Hayasaka Tasuku, who both seem to have secrets of their own. What experiences await her and will she ever find out who her Ashinaga Ojisan is?