Hitoku no Ω wa Unmei wo Korosu

After enrolling in a prestigious academy filled with alphas, Kureta, spends his days hiding he is omega, while overdosing on inhibitors. When he was unwell due to the side effects of inhibitors, he was helped by the handsome and popular Inukai-senpai, and he was attracted to his sweet and good smell. After that, Kureta started spending time with his senior, and thought that the distance between him and Inukai had narrowed, but one word from his senior's mouth shocked Kureta...

(Source: Kobunsha, translated)

Note: Includes three extra chapters.