Shokei Sareta Shinimodori no Dairoku Ouji wa Kokoku wo Sute, Ringoku no Guillotine Koujo to Fukushuu wo Chikau

Gustave is the Sixth Prince of the Kingdom. He was supposed to marry into the enemy nation as a consort and lead his own country to victory by maneuvering in the shadows, but he was betrayed by his very own homeland and executed. He died along with his wife, Abigail, who was feared as the "Guillotine Princess."

And then, the place where Gustave woke up was the world from six years in the past.