My favorite ongoing series The Genius Prince’s Guide to Raising a Nation Out of Debt released a non-credit version of the opening theme, the video is available to watch on YouTube.
The opening of the series titled as “Level” which is performed by Nagi Yanagi x THE SIXTH LIE covering the events that will happen in the anime. You can see the video below:
The Genius Prince’s Guide to Raising a Nation Out of Debt is a Japanese light novel series written by Toru Toba and illustrated by Fal_Maro, the series currently has over 10 volumes, the English version of the series is available on Yen Press who describe the story as below:
It ain’t easy being a genius…
Prince Wein is ready to commit treason. And who can blame him? Faced with the impossible task of ruling his pathetic little kingdom, this poor guy just can’t catch a break! But with his brilliant idea of auctioning off his country, this lazy prince should be able to retire once and for all. Or that was the plan…until his treasonous schemes lead to disastrous consequences-namely, accidental victories and the favor of his people!