Salaryman section chief Utsumi (alpha) is in love with his subordinate omega Mochizuki, who doesn't seem interested at all. So, he buys and expensive drug called the Pink Potion that induced heat in an omega, making them fall for the alpha that combines the potion with a drop of their blood. He tries to sneakily get Mochizuki to drink it but Suzuki, who he thinks is a beta, ends up drinking it. Suzuki is actually an omega and they have sex in the locker room shower.
I like the growth of the characters in this one. The alpha is kinda scummy at first with the potion but redeems himself
Omega wa Pink no Yume wo Miru