Tokiwa-sou no Futari

[“Please put on your pants”—My new roommate is a sexually liberated, naive senior!?] Tatsumi, a beta, attends an all-boys boarding school that is co-educational for alphas, betas, and omegas. He was looking forward to the annual dorm change, but he was assigned to a dilapidated old dorm located in a separate building. To make matters worse, his roommate is Yuma, an upperclassman rumored to have failed a year because he was always having sex...!? On his first day, he stumbles upon Yuma masturbating, but Yuma doesn't seem to mind, saying, "Now we can masturbate together." What will become of the cohabitation of this serious, sensible person and a laid-back, clingy person?