Usotsuki na Kanojo

Marie always puts herself back, lies to her friends that she's a love master. Manami, Marie's bestfriend, trusts her and asks her and her boyfriend to go to a double date. Marie who doesn't have any boyfriend gets panicked and at the end she asks for Yamato's help. Yamato is willing to help her, but... with payback! (Source: Shoujo Crusade/TCmanga)