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.
In a Holy Grail War, Mages (Masters) and their Heroic Spirits (Servants) fight for the control of the Holy Grail—an omnipotent wish-granting device said to fulfill any desire. Years have passed since the end of the Fifth Holy Grail War in Japan. Now, signs portend the emergence of a new Holy Grail in the western American city of Snowfield. Sure enough, Masters and Servants begin to gather... A missing Servant class... Impossible Servant summonings... A nation shrouded in secrecy... And a city created as a battleground. In the face of such irregularities, the Holy Grail War is twisted and driven into the depth of madness. Let the curtain rise on a masquerade of humans and heroes, made to dance upon the stage of a false Holy Grail.