Ernest is the third son of the Vionetti noble family. As an adult, he cannot inherit the family estate, so he chooses the path of an adventurer to make a living. His only reliable assets are his underwhelming unique skill 'Magic Bullet' and the knowledge written in the family's secret book, 'The Summoning Story of Another World'. Despite being viewed through a colored lens due to his siblings' 'Disaster-level' abilities, he diligently visits the guild every day. This is a story of his humble yet determined rise as an adventurer, armed with his beloved book and mediocre skills in both sword and magic. The main story has concluded.