Absolute Boyfriend (Zettai Kareshi) is a manga series by Yuu Watase.
Riiko Izawa has never had a boyfriend and she has been rejected by every boy she has ever had a crush on. Until one day she meets gaku a strange salesmen who gives her his company card. later riiko returnes home and looks at the company wedsite. their showing up "nightly lover" series a "figure" which will be her boyfriend if she orders him. She does and he comes to her in a box when she opens it he falls out naked. a kiss boots him up he wakes up and say's "hello my girlfriend". the story then takes off and you meet riiko's childhood friend soshi who is suspecious of night (the figure riiko ordered) Things get complex when soshi admittes his love for riiko and tries to make her choose between him or night. So almost throughout the entire series ur left worndering who she'll end up with. but u find out almost near the end but things don't end up so happy ever after.