Hunter × Hunter: The Sun Breathing Zoldyck

Roy thought adapting to life as the eldest son of the world's most notorious assassin family would be his greatest challenge. With Silva's cold indifference, Kikyo's unhinged obsessions, Illumi's robotic nature, and Zeno's daily kill count, simply maintaining his humanity felt like an impossible task. Then he awakened his Nen ability—and everything changed. The "Gate of Recognition" doesn't merely unlock memories; it opens doorways to entirely different lives. Through deep sleep, Roy finds himself transported into the world of Kamado Eiichiro, older brother to Tanjiro in a realm plagued by man-eating demons. There, he discovers Sun Breathing, the legendary technique that burns away darkness itself. But this power comes at a steep price. Each night spent in the demon-infested mountains strengthens him, yet every morning back on Kukuroo Mountain serves as a harsh reminder that his real family sees him as nothing more than a failed heir. As Silva's disappointment deepens with Roy's refusal to become the emotionless killer they demand, his newfound abilities begin attracting unwanted attention from the very people he's desperately trying to avoid becoming.