Twenty and Adult (Volumes 1-7) by Sei Soragami Bessatsu Friend Comics This is an office romance between Momoi Aya, a 20-year-old, third-year working adult, and Higa Yamato, a sophisticated junior colleague who is 6 years her senior. The story follows Aya, who is in charge of training, as she is captivated by Higa, who displays the composure of an adult and gradually takes control. I've only read it once. It's in almost new condition, as good as new.