F-Rank Soul Eater

In a world threatened by monstrous invaders from another dimension, humanity's final hope rests with the Soul Mechas. These enormous war machines are designed to combat the Eldritch horrors, but their power source is unique: ancient, mythical souls from the very realm the invaders originate. The critical condition is that these powerful souls are only attracted to the most profound human suffering—helplessness, anguish, and immense loss. The deeper the despair, the stronger the connection. Soren enters this dire situation, a young man who shatters all predictions. Despite the empire's insistent demands to develop formidable Soulbound Warriors and the significant weight of his father's old curse, Soren maintains an unshakeable optimism and remains a joyful dreamer. This unusual nature sets him apart, making him an outsider within the established system.