A Hint of Purple

From Storm in Heaven:
There's a legend about a certain library at the Doumeikan University: whoever meets there for the first time will fall in love. One fateful day, Shino waits for her date there, but she doesn't meet him. Instead she meets a football player who took refuge there, trying to avoid his angry teammates. Then the two surprisingly find out that their parents are getting married, and so they start to live together…