After a mysterious death, King Grey is reborn as Arthur Leywin on the magical continent of Dicathen. Although he enters his second life as a baby, his previous wisdom remains. He begins to master magic and forge his own path as the years go by, seeking to correct the mistakes of his past life.

The autonomous robot staff of the Gingarou Hotel, led by concierge Yachiyo, as they maintain the deserted hotel in a post-human Earth. After humans evacuate due to a toxic environmental contagion, the robots wait for their return, until alien guests, starting with an extraterrestrial visitor and then a family of tanuki aliens, begin to arrive. The season explores their adaptation to serving alien clients, the humorous and sometimes melancholic challenges of their duties in a world without humans, and the evolving relationships between the robot staff and their new, non-human guests.