Crest was born as the fifth son of a duke's family. However, as the fifth son, he had almost no standing and was treated like a slave by his childhood friend and fiancée, Elise. At his coming-of-age ceremony, Crest obtained a skill called 'Gacha,' which allows him to acquire other skills. However, due to his inability to use it, he was exiled from his home. Abandoned in a forest full of monsters, Crest begins to understand the power of 'Gacha.' Determined to survive and rise again, Crest sets out on his new journey.