As Arm enters university, he is introduced to his peer mentor group, the Perfect 10 Liners. He unintentionally gets off on the wrong foot with his senior, Arc, after posting his photo on the Engineer Cute Boy page.
Arc shows a different side of himself after the car accident. As Arm's pinning ceremony approaches, Arc encourages Arm to make more of an effort to get to know him more.
Arc confesses his feelings but Arm asks for more time to reflect on how he feels. However, Arm starts to feel possessive when Arc's buddy Brink makes an appearance.