Kashikomarimashita, Destiny
Ch 1-3 is an intro story for the main story (ch 4 onwards). It's about two heirs (of different companies), one of which is a successful omega and the other is a less successful alpha. With the omega's parents' death, his stepmother banishes him as unfit to be the heir. He then becomes the butler of the alpha. The main story is about the omega's butler, a beta, and his journey on outgrowing his own prejudice against subgenders and finding his own happiness. Note: in the start of the manga, the MC (the butler) mentions several groundless biases humans have (against less educated people, against people of color, against people of a certain blood type (honestly the most out of the world one lol), against (old) bachelors/bachelorettes, and ultimately against omegas). The point of this line is to expose how groundless the bias is and that they are untrue. Do not take offense. It may be uncomfortable, but the author's point is that it is untrue and unfair.
Sayonara Alpha