The Whole World Panicked After I Turned Black

My sister is the Flame Dragon Armor Summoner, and she fights and kills monsters day after day in order to atone for my sins. Just because I was controlled by a supernatural beast since I was a child, and they wanted to train me into a killing machine. The older sister and younger sister were injured in a battle with a supernatural beast. They could no longer transform and fight for a short time, and the summoner was taken back by the organization. The supernatural beast seized this opportunity and brutally killed my sister, who disappeared. The War Armor organization looked on with cold eyes and said that my sister's death was to atone for my sins. That day, I held my sister's body and cried bitterly, and my sister's weak words echoed in my ears. "Live well and find your sister." The Warframe organization resisted: "Don't think about joining us, continue to join the dark side. Even if you have never killed anyone, you are not worthy of joining us." I was so angry that I laughed back: "Hahaha, if you want me to be evil, then I will be evil for you to see!" I, who have turned black, don't need a summoner to transform into a snow mastiff armor! He even later transformed into the strongest Shura armor! War armor organization, supernatural beasts, the whole world is panicking!