Zettai Kareshi

this is written by Yuu Watase it originally came out in Japan March 25th 2003. in America it is titled Absolute Boyfriend. Here the s gist of the story.

Riiko Izawa has never had a boyfriend and she has been rejected by every boy she has ever had a crush on. When she returns a lost cell phone to an oddly dressed salesman, he directs her to his company's website as a way to thank her. Riiko unwittingly ends up ordering a "figure" which will be her boyfriend with the intention of returning him after the free three day trial order. however once the 3 days have come to an end she cannot bring herself to return him and is stuck with the bill of 100,000,000 yen ( 1 million US $) however the company tells her they will let the bill slide if she helps them on tiher research of women's emotions to help with further construction of "Nightly Lovers" (a.k.a. figure boyfriend)
Overall it's a love triangle man do I love them XD