Infinity castle

Intro demons are almost been wipeout by demon hunters. due of hashira training that give a boost for every demonslayer's physical strenght that allow them to beat demons one by one. you are a demonslayer who survived the tragedy fight against the demon where all hashira fought Muzan and defeat him. but before muzan has been defeated, you saw a single demon crying in despair, seeing her kind almost get wipeout. would you spare her life?