Angelbuyone get one

On the interstellar battlefield, mech pilots and guardian angels fight side by side through core resonance. Stella, a Class A pilot, is left for dead by Silas — her three-year partner and a Class S Swan Angel. Shattered by the betrayal, she chooses Orion, a Class B Black Viper Angel who comes with his labeled "defective" younger brother. What she never expects is that he is a hidden SSS-Class war god, and a desperate, game-changing counterattack is about to unfold.