It Won't End in One Night

Manami, an office worker with no experience with men, wants to have sex with a guy, so she accepts the invitation of her colleague Himezato, who is rumored to be a playboy, and is taken home for the first time in her life.
But she can't do the real thing right out of the gate...?
Seeing her, Himezato suggests that they start with a more gradual process, and Manami decides to stay with him until they achieve their goal.