I Have a Fairy Sister Who Will Accompany Me Throughout My Life

I was just an ordinary boy wandering around in the city, until one day, a demon princess from another world forcibly lodged her residual soul in my mind. Her country was ruined and her family was destroyed, leaving only a trace of her soul on the verge of dissipating; I was stumbling in the world, exhausted by life. There is no heaven-defying system, no world domination, just two people crushed by fate, warming each other up in the world. She accompanied me from childhood to ignorance, through the ups and downs of food delivery, withstanding the difficulties in the workplace, and through the hardships of life; I gave her a place to stay, allowing her to regain a name, a family, and a way home in the unfamiliar modern world. No revenge, no fighting monsters, no ruthlessness, just a long-lasting companionship. From the daily fireworks in the rental house to the trials and tribulations of youth and the stability of the years, she accompanied him with her soul, and he responded with his life. This world is hard, but because of you, it's worth the journey.