Volume 2 (Manga)

This is the second volume of the I'm Quitting Heroing: Next Gig Is at the Demon Queen's Castle manga adaptation.

Synopsis
Leo, the strongest hero, rejoins the Evil King Army! Just as they started to move to rebuild, two of the Heavenly Kings left! Innovation by combining knowledge and education accumulated for thousands of years!Thousands of years? The strongest secret is finally revealed!?