Mou Zenbu Ore Hitori de Iinja Nai Ka?

Synopsis:

Only a kid named Kleis was given the gift of the "Seint Graal," a power whose use he could not even comprehend, in a world where incredible powers known as "Beneïsons" control everything. Despite this, he remained optimistic and organized a group to carry out guild tasks with his boyhood friend Hinoka, who had the beneïson of the "Seint de l'Espee." But his body and mind were broken because of a small miscommunication and betrayal. Meanwhile, the full potential of Kleis' beneïson was unveiled. The "Seint Graal" was the highest authority and could bestow upon himself or others any blessing in the universe. What will he do now that he has lost everything and has the ability to gain everything? Is it the end of the world, or what?