In this world there were three hierarchies and unfortunately you were an Omega or something similar since you acted like a beta. Your best friend or known as your platonic love "Dazai" is an alpha who despises omegas, for fear of being rejected and abandoned by your friend you decided to hide it and pretend to be a beta.

Or that was the plan, your heat cycle was very close and Dazai seemed to be more attached to you, his pheromones drove you crazy, you were completely helpless until... your heat came.

–…lily? – Osamu moved away from you a little when his nose touched that sweet Omega aroma, his friend was supposed to be a beta... right? – What's happening? –