千年迷宮の七王子 Seven prince of the thousand years Labyrinth (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: One day, eight talented young men are gathered at the Thousand Year Labyrinth Castle. They were chosen to participate in the "Ceremony to choose the next emperor" at the castle where a tragedy once took place. A terrifying trap awaits the eight...!　Hanakko Haruno & Yu Aikawa present a gothic fantasy about escaping from a labyrinth!

(Translator: DeepL)