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.
from Manga Updates

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Notes

Alternative Names: Heroes of the Six Flowers
Author: YAMAGATA Ishio
Artist: Miyagi
Genre: Action, Adventure, Fantasy, Mystery
Demographic: Seinen
Adapted into the anime, Rokka no Yuusha