Black Clover: The Lethal Dose

In a world where magic is everything, two boys are born with none. While Asta trains his body to defy their fate, his brother, Askin, would much rather take a nap. Found abandoned together at the Hage Village church, the trio of Asta, Yuno, and Askin grow up with a shared dream: to become the Wizard King. But Askin's approach to this grand ambition is one of lazy observation and cynical amusement.

Beneath his indolent and eccentric exterior, however, lies a terrifying and alien power. Askin is not just mana-less; he is a living anomaly, a vessel for an ability he calls The Deathdealing. He can analyze, manipulate, and master the "absolute lethal dose" of any substance he's exposed to-including the very mana that defines their world. By taking a hit, he can render an opponent's magic completely harmless to himself, and worse, turn their own power into a deadly poison that kills them from the inside out.

Armed with a mysterious five-leaf clover grimoire that serves as a research journal for a sealed, ancient devil, Askin is dragged into a world of deadly missions, political intrigue, and threats that could shatter the kingdom. He is not a hero. He is not a villain. He is a scientist in a world of wizards, and his grand experiment has only just begun. Can a man who can master the formula for death find a reason to fight for life? And what will happen when the world learns that the most dangerous grimoire isn't the one that negates magic, but the one that writes the prescription for its demise?