Notes:

"The whole premise of this manga is that 3 past friends from the main character wish to marry him, and they move in to his school and form a “pact” in order to try and seduce him (there’s even a writen contract). Least to say their methods are anything but subtle. It’s pretty funny tough."-Ingway

Sauce:
http://www.mangahere.co/manga/iinazuke_kyoutei/c001/