Shikkokutsukai no Saikyou Yuusha: Nakama Zenin ni Uragirareta node Saikyou no Mamono to Kumimasu

There are always 16 heroes. Amongst them the Darkness Hero, Shion, the strongest hero in history. Shion has only one thing he believes in, his party members. However, those girls he believed in cruelly betrayed him. Is there a way for Shion to overcome his deep pain and keep on living?

(Source: Manga UP!)