Rokka No Yuusha

when the majin awoke from the depths of darkness, the deity of fate chose six heroes and bequeathed them with the power to save the world. adoretto, a boy who proclaims himself the strongest on earth, was selected among the rokka no yūsha (heroes of the six flowers), and he goes to the rendezvous point — but seven have gathered there. the heroes suspect that someone among the seven is the enemy, and the initial suspicion falls on adoretto.