The enjoyment of life.
There is no doubting the potential of humanity, in a far future humanity will achieve a technological level where it is not inappropriate to call them god. Humanity influences span the entire universe and beyond, for them creating galaxies from scratch is considered child play.
One human boy found himself upon a world of fantasy fully equipped with dragons, angels and most importantly magic.
The boy shall explore this new world to live his life to the fullest, and finally gain back something he lost long ago.