Hazure Skill "Gacha" de Tsuihou Sareta Ore wa, Wagamama Osananajimi o Zetsuen Shi Kakusei Suru

Synopsis:

Crest was a duke's sixth son at birth. But he was no fit to speak, being the fifth son. Ellis, his fiancée and childhood friend, treated him like a slave. At his coming-of-age ceremony, Crest was also awarded the skill "Gacha." Yet, he wasn't able to learn how to use it and was banished away from his home. Banished into the forest full of monsters, Crest began to understand the power "Gacha." And then, Crest made up his mind. He will definitely survive and get back on his feet.