Light gets a useless skill in a world where one wrong fruit kills you dead, then watches his childhood friend sprint past him toward legendary status. He doesn't get stronger faster or smarter or luckier. He gets better at eating poison. The show is about the specific kind of humiliation that comes from being left behind by someone you promised to match, and the only way forward is to swallow something that's supposed to kill you, over and over, until your body stops dying. That's the entire premise. That's the entire show. Every episode is Light choosing to eat another fruit because standing still while Rena becomes a legend is worse than the chance of getting erased.

Light wants to be the world's greatest adventurer, but his skill fruit gives him a dud. Fruitmaster only helps him grow fruit and is worthless in a fight, and there is no second chance: eat another skill fruit and you die. So when his childhood friend Rena rockets to S Rank while Light spends his days farming and swinging a sword, the gap between them grows harder to swallow. Then Light makes a mistake that should kill him. He eats a second fruit. Somehow, impossibly, he survives. What seemed like the worst skill in existence turns out to be the best: Light can consume as many skill fruits as he likes, gaining a new ability with each one. Now he has a real shot at closing the distance to Rena and becoming the strongest adventurer of all.