Revenge and Rise

Y/N, an abandoned child left to fend for himself, betrayed by his friends and family, Y/N wondered inside a forest finding a cave, inside lies a small chest bearing the Crest of Shadows, with the box opened shadowy figures enters Y/N's body and gave him the Shadow techniques, Y/N swore revenge against those who betrayed him, Y/N wondered the world murdering people who stands in his way, what happens if they are interested in him, will he join them or continue being alone?