Perfect 10 Liners is a group of perfect faces! Arm takes on the role of managing the Engineer Cute Boy page and unknowingly breaks the rules by posting a photo of his peer mentor's mentor Arc, also known as Perfect 10 Ferocious. Meanwhile, Gun has problems sleeping in the dark, but Perfect 10 Mysterious Yotha, Arm's peer mentee, volunteers to be his roommate. Lastly, Perfect 10 Piteous Wine is a peer mentee of Yotha who has no time to take care of him, so Yotha's younger brother Faifa steps in instead!

How will the relationships and romances between the three Engineering student couples of the Perfect 10 Liners unfold?