Watches do more that just tell time and the date many of them also control giant robots (Giant Robo and Big O)
If you're a loser, on your way to a new school or new town and happen to met an attractive female and end up in an embarrassing situation, rest assured this girl will fall in love with you.
Not only that but it's a safe bet you will meet several more girls will show up most likely, the popular girl in school (if in school) a tomboy, a dizzy and a girl several years younger than you but your heart will always belong to the first girl (any harem series)
This is something I've been wondering, why is it always the first girl the main character in harem shows always ends up with?