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The people of this world are given occupations and weapons called Divine Treasures by God. It was said that the treasure was very strong and couldn’t be compared to the Human-made weapons. That’s why, occupations which were called “Blacksmith”, who can make and modify weapons are called the weakest.The main protagonist Relius who has acquired such a weakest job. He gave up on becoming an adventurer and worked in an inn, but he realized that he could make “Anything”. He, who was making what he liked, became aware of the relationship with famous nobles and beautiful girls.
Yamada Tarou is living a regular life, until the death of the father he never sees catapults him into the role of the 13th King of the holy Phantasma kingdom. Now that hes king, Tarou has become the target of assassins, and all he has on his side is a mistress, Princess Kaguya, whose goal is to make Tarou a worthy king.