A Knight and a Magical Girl

Ichinose Yu, a Cyborg Knight from another world. Five years ago, he was transformed by the villain organization into a scorpion-themed biochemical modification. After the brainwashing failed, he lost his memory, but retained the instinct to protect mankind. In the decisive battle with the final BOSS of the original world, the energy collision brought him to this strange world. There is no Kamen Rider here, but there are magical girls and monsters. After being seriously injured and comatose, he was adopted by a woman who owned a cafe. From then on, he became anonymous and worked in the cafe for five years. Five years later, the transformer finally returned to being able to transform once. However, just when he thought he could continue to be an ordinary person, monsters attacked and his adopted sister was in dire straits. "Brother——!" Listening to his sister's heartbreaking cries, he decided to transform. The Shadow Scorpion's kick penetrated the monster's chest, but he fell due to the backlash of his transformation. On the verge of death, a mysterious goblin appears in front of him. "Human... Do you have the courage to go with the devil?" When he woke up, he found that he had an additional identity——