Sleepy Princess in the Demon Castle is a manga series that launched in 2016 and is still going, with volume 14 being the most recent. Viz Media have an English version.
It’s not surprising to see that Kagiji Kumanomata work is getting an anime.
The trailer is 60-seconds long and announces a multi-channel premiere in Japan of October 2020. We don’t get much. Princess Syalis wonders around looking for a place to sleep.
Teddy Demon guards become a pillow. The magical Shield of the Wind becomes an air mattress. The princess’s guards quickly discover that she’s a little, well, princess.
The studio also released a key visual for the series.
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