Maseki Gourmet: Mamono no Chikara wo Tabeta Ore wa Saikyou!

Ein Roundheart is reborn in a fantasy world after a strange gacha event and is given a skill for neutralizing poisons. His younger brother, however, is favored for having a more impressive combat ability. Despite Ein's efforts, his father and stepmother overlook him in favor of their younger son as the family heir. His situation becomes more complex after meeting a girl named Krone, leading to Ein and his mother being cast out by the family. They seek refuge in Krone’s kingdom, where Ein is unexpectedly named crown prince. This new status begins a fresh chapter in his life, and he aims to prove himself as the rightful heir.