Crest was born 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, Ellis. During his coming-of-age ceremony, Crest obtained a skill called 'Gacha' that allowed him to acquire other skills. However, unable to understand how to use it, he was banished from his home. Abandoned in a forest full of monsters, Crest finally understands the power of 'Gacha'. He makes a decision: to survive and rise to the top.