Many years ago, Father Tinker, a great mathematician and inventor, created a model of a hyperphase gate that allows you to move between worlds. However, his invention was not used by those for whom it was intended. The gates were opened, and since then the American city of Pittsburgh has constantly, with the exception of only one day a year, been beyond reality - on the planet Elfdom. Thus, close contact has arisen between people and elves - immortal humanoid creatures, once as a strategy for their own improvement by those who have chosen magic.