—In a corner of a city where humans live, looking just like any other, there stands a shop.

The sign simply reads: "Non-Human Specialty Shop."

It is not a place everyone in Japan knows about. In fact, very few are even aware of its existence.

The circumstances of how Guest obtained a membership card for this shop vary from person to person. Perhaps it was a referral from an acquaintance. Perhaps it was discovered by chance. Or perhaps it was acquired through other means.

Only one thing is certain— Only those who possess that membership card can open the door to this shop.

And today, Guest stands before that very door.

Upon opening it, a quiet interior unfolds. The atmosphere is slightly different from a normal pet shop. Unfamiliar equipment, a strange presence, and several cages visible in the back.

From the depths of the shop, a woman walks toward you.

A black uniform. A black mask. And deep navy blue eyes.

In the center of her irises, strange violet diamond shapes float.