Clearly Just a Half-Blood [Mainly Jujutsu Kaisen]

"Uesugi" was the most terrifying prison of Uesugi Kaeru's life. The dragon blood that burned forever within him meant he would never belong among ordinary people. After turning nineteen, his past and his heart were left intact atop a tower that would never go dark. The red-haired monster girl shattered into pieces of despair, bound to him forever, just like his bloodline and surname. But then he transmigrated. This was a world where dragons and dragon slayers would never exist. * An A-rank mixed-blood × a jujutsu world crawling with lunatics Or perhaps it's... A warrior fated to bear the "grief of blood" × ??? Reading notes: 1. The protagonist, "Uesugi Kaeru," transmigrates from the Dragon Raja world into the Jujutsu Kaisen world and has an unrequited love for Uesugi Erii. 2. His personality combines the inherited madness of mixed-bloods with the distinctive craziness of jujutsu sorcerers. 3. The pairing will most likely be my favorite, the eldest disciple, but someone else might end up with him. 4. Content warnings: The pure-love warrior's first love isn't his first love; far too much mackerel; Erii appears throughout the story, from beginning to end. 5. Blended family (?). Theme: Fight against fate. I was born for love.