I Love My President Though He is a Psycho

The heroine is a third year student that's studying to be a cartoonist. She met with the owner of a large company, who asks to return him to his child, which she allegedly gave birth three years ago. The girl doesn't understand what he's talking about, as never met, and certainly not have children. He uses every opportunity to get her to return the child. The girl eventually realizes that the man suffers from paranoia or some type of mental disorder.