Waltraute-san no Konkatsu Jijou

Waltraute-san no Konkatsu Jijou summary:

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.