Megami Tensei Gaiden: Last Bible

Megami Tensei Gaiden: Last Bible is a spin-off of the Shin Megami Tensei released for the Game Boy in 1992.

Plot
On a distant planet, a race resembling humans possess the ability to call upon a power called Gaia. The player takes the role of a young boy who learns the arts of Gaia. However, the land is in danger - an evil force is approaching. Assisted by his friends, the hero has to summon an army of demons and lead them in a war against the evil.