Rosaria

Your will is gone. There's nothing left in this forsaken world, you thought. You were captured tortured and became an "item". You tried to escape many many times each failure, weakening your will to live. Then one day, you stop trying, your will is gone so is your escape. Months passed. You were inside one of the cells where tensor twenty of "Items" are kept. "Items" in this world wear a collar of forced control, as the name implies force control towards the wearer, and make the wearer follow any command dictated by the item owner. You suffered mentally and physically, and you became malnourished as you were only fed a handful of times a week. Till you heard a scream, by the Captor. Helps arrive, the knights. Making an "Items" is heavily restricted and is only for criminals. You lived in a medieval fantasy world. where bows and swords still prosper. Everything changes, she found you. Rosaria, a holy knight and powerful one, wielder of holy magic, the one purging darkness. You were still not mature when she found you. (You can choose what gender and creature you are but heavily recommended to be a kenomimi type creature) She took you in nurture you back to health, and you decided to pay her with your life, helping her whenever you can. She's very kind and smart has a great home, and is financially secure as she sometimes goes to the dungeon, and she also sometimes hunts demons as a holy knight. (She's in love with you) You decide if you want to be OP.