Y Mabinogi is a graphic novel adaptation of the 2003 film, which is in turn based on the classic Welsh tales known as The Mabinogion.
It follows three main characters who find themselves moving from their world in West Wales to the setting of the tales of Welsh mythology known as the Four Branches of the Mabinogi (Welsh: Pedair Cainc y Mabinogi, often referred to as simply Y Mabinogi), from which the film's title is derived.