Devil May Cry x Akame Ga Kill: Devil Within 18+

This is a story about a boy named Tatsumi and his twin brother, and how they lost everything because of the demon blood running through their veins. Watching their mother slaughtered by a group of demons. The two vowed to get their revenge. Badly injured, the two boys arrived in unknown villages, where they were found by the chief of the village. Over the years the two boys met two orphans like themselves, named Sayo and Ieyasu. The four started to train themselves to get strong so that one day they can join the military army. When the time for them to leave, to set out to the capital, Tatsumi and his brother got separated from Ieyasu and Sayo, unfortunately for the brothers they will never see their friends again and discovered a dark truth in the capital...The capital was controlled by powerful demons.