This is a good old manga. IMO Yoshizumi Wataru is one of the great craftspeople of manga--like Morinaga Milk in yuri, she doesn't do anything particularly original, but all the little details are good--from good solid art to snappy dialogue, good pacing, a nice balance with enough tension not to be bland but not so much as to make it an angstfest. It all adds up to produce some of the classics of shoujo romance, like Marmalade Boy and Kimi Shika Iranai.