All Riiko Izawa wants is a boyfriend, but she has been rejected left and right by every guy she has ever liked. In a moment of desperation, she orders a special "Nightly Lover" figure from a website, and the next day, a extremely attractive naked man is delivered to her doorstep! Night, as Riiko names him, is the perfect boyfriend; he's sexy, smart, athletic, and is a gourmet cook. There's just one problem: he cost $1,000,000! Riiko can't let anyone know that Night is a doll, even though he knows almost nothing about humans. Can she find a way to pay for Night while keeping him a secret from her childhood friend Soshi next door?
Both comics have a similar main character and the sudden appearance of a somewhat perfect guy that tries his hardest to love her. The two main guys are similar as well. However, Zettai Kareshi is more mature and tragic. IT"S JUST PLAIN TRAGIC! Ikenei is shorter and funny.