Traveling Through Another World, Offering Poems About Cause and Effect

After my death, I was brought to a magical world by the system. It issues tasks, gives me unique powers, and transforms me from a mortal into a hero. I thought it was here to help me. Until my best friend blocked a fatal blow for me. Until my respected mentor died in the mission of "Optimal Solution". Until the love in my arms was reduced to ashes by the "ultimate enemy" predicted by it... I realized that every reward it gave was taking someone away from me. When the world was on the verge of collapse because of me, it finally revealed its true form - the man with a weathered face and eyes exactly like mine. He said to me, "Welcome back." "Now, let's complete this last mission together." ——Killing ourselves and the world that is destined to die because of us.