Based on Dragon Quest V: Hand of the Heavenly Bride.
Ryuka was enslaved and forced into building a great temple after being stolen from his father who he watched be killed by powerful foes when he was trying to protect him as a child. When he escapes slavery 10 years later he starts a journey to uncover the secrets of his father's past and soon finds out his mother is still alive, so he sets off on an adventure to rescue her from the underworld. And, of course, he must also make the difficult decision of who to marry... Bianca or Flora?
Manga