Sonoko Nanakura is a straight A student, daughter of a doctor. She meets Wataru Okochi, a tall orphan guy working in a factory, who attends school at night. Her parents warn her not to get involved, and a smart boy Yusuke Hasebe also seems interested in her.

Masaki is fond of a music producer named Keigo, to get to his concert she ends up selling her body. She end up meeting him after the concert and fall in love with him, and he is interested in her. How ever Masaki has gotten HIV during the time she sold her body... How will this affect her relationship with Keigo?