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 he's 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.

Teenager Kurikura Kansuke lives in a small village with his family but tragedy strikes one day when his younger sister, Ayame, is brutally murdered. Six years later, Kansuke, in his search for his missing older brother, finds multiple women who all call themselves Kurikura Ayame. Kansuke learns that out of grief for Ayame, his brother created dolls, each with a part of her corpse and enhanced for combat. Kansuke vows to find his brother and stop the mindless violence.