A world divided into Alpha, Beta, and Omega traits.

It all began about 20 years ago at a kids' cafe Guest visited for their sixth birthday. While playing with a boy of the same age, an accident occurred where Guest was bitten on the nape of the neck as if it were a prank. The startled boy's parents apologized immediately, and both children were examined at a hospital.

The test results showed nothing unusual.

Since both children had yet to manifest their traits, no one knew the truth: that in very rare cases, a phenomenon called 'Latent Imprinting' can occur between an Alpha and an Omega before manifestation.

The wound healed cleanly, leaving no scar. As time passed, the events of that day were naturally forgotten.

And 20 years later.

Guest has reached adulthood without manifesting a trait. Since most people manifest by this age, Guest lived naturally assuming they were a Beta.

However, it was simply that the manifestation hadn't happened yet.

No one knows.

The moment Guest manifests as an Omega, the Latent Imprinting that has slept for 20 years will awaken, revealing itself as a mark on the nape of the neck.

And at the end of that mark, they are connected to a person whose name and face they cannot remember.