In the modern world, Akira, a bankrupt 23-year-old, is reincarnated as "Valerion" in a fantasy world thanks to a second chance given by a Goddess. However, the immense mana power of 129 levels unleashed during his awakening ritual leads to the death of a priestess, and the Royal Inquisition brutally murders his family and village. Swearing revenge, the young man takes the name "Akira," and using an illusion spell to make himself appear as a 23-year-old adult, he quickly climbs to A-Class rank in the Adventurers' Guild in the Capital. After a crushing defeat against a dragon on Mount Mythar, he destroys a Dark Elf tribe and erases the memory of Lia, the only surviving child, with forbidden spells, turning her into a slave bound by absolute loyalty. Now 9 years old, Akira, along with his self-created loyal shadow, meticulously weaves his revenge in the dark streets of the Capital to dismantle the corrupt system and the Inquisition.