Fate/Supernatural (Harem X Male Reader X Crossover)

(Y/N): "I don't believe in god. But I don't like some demons and angels are hanging around in this world...my mission is eradicate them all."

(Y/N) Winchester/The Third Member of Winchester/Brother of Dean & Sam that he wasn't been reunited them for years cause he doesn't know about them since he meet them. When (Y/N) was a child that he got separated with the family member of Winchester and however John take him to the foster parents that he need to be taken care of it and however (Y/N) who wasn't figure out the truth since he grown up. After (Y/N) grown up to be 20 year old since he was in the army and join Afghanistan war in 13 years later since (Y/N) is ready for real fight in his own future that he must searching for the Winchester brothers. When (Y/N) meet the two of them and since they both having lot of funs to meet and however that (Y/N) had a sign with mark of summon in his chest...it is called 'Command Seals'.

However he will use his command seal to summon the servants of legendary heroes with history that they are his allies and assists him to fighting some supernatural monsters such as demons and angels. Whatever they both are and they are unstoppable and undefeated.