In the world of Norse Mythology, a human boy falls in love with Waltraute, the fourth valkyrie sister. He wishes to marry her, but Waltraute gives him an impossible challenge to deter him. Nevertheless, the boy is determined to carry out the dangerous task, and to marry Waltraute afterwards.
Toru Acura, an incredibly lazy man with some hidden talents, has been forced by his sister Akari to actually go outside and search for work. However, he is in for a big surprise when he meets the girl who carries a coffin on the back named Chaika Trabant in the forest, and they are suddenly attacked by a monster! How...