I Think I'll Hide My True Ability to the Last Moment

Story:

Introducing a world in which you can make an agreement with God and acquire supernatural skills. Born as the third son of a famous knightly family, Yuno was so busy controlling his innate power that, before he knew it, he was nicknamed "talentless." However, shortly after entering an elite knightly academy, the protagonist met a homeless goddess who was nicknamed a loser. Unable to endure the mockery of the goddess, Yuno decides to conclude an agreement with her in order to make her stronger and glorify the name given to her all over the world!