Through some light digging in the original video's description, and with the help of Google Translate, we found out that the drone isn't actually for sale, but made by a tourism board in the town of Oji, Nara, "a town related to Prince Shotoku."
According to his Wikipedia page, Shokotu "was a semi-legendary regentand a politician of the Asuka periodin Japan... Over successive generations, a devotional cult arose around the figure of Prince Shōtoku for the protection of Japan, the Imperial Family, and for Buddhism."
Apparently, Prince Shotoku had a pet whose name was Yuikmaru, and Oji is where the fabled dog's grave is located.
In an attempt to draw attention to the rich history of the town, the tourism board built this lovable drone to pay homage to the long lost pet of Prince Shotoku, and then took it out for a stroll in the town, showcasing the town's tourist hotspots.
The makers of the Yakimaru Skywalker say it is "possibly the world's first mascot drone." If it isn't the first, it's definitely the cutest.