Kamigami ni Sodaterareshi Mono, Saikyou to Naru

Will, an abandoned child, was brought to Table Mountain by the God of Thousand Theophanies, then educated by the God of Sword, Healing, and Magic. He grew up to be a surprisingly brave, strong and sweet boy. When he turned fourteen, a blind priestess Lunamaria visits the mountain and asked him to save the world. Thus the journey begins...!

(Source: Kadokawa)