The protagonist of this work is 30-year-old Sada Seiya who works in a general trading company.He is a handsome guy and the ace of his department, but he has a secret that only Uno Daiki, a junior at university and company, knows.That is the character who naturally likes to be cool, and implemented the setting of “having a girlfriend” who has been dating for many years, and ended up becoming a “half-virgin=0.5D”.In this way, he fell in love again after 10 years and received love guidance from Uno, who had 8 girlfriends.