In order to retrieve the Sacred Treasure known as the Grass-Cutting Sword, Kazuki and his companions head to the Magical Domain’s snow-topped mountain, only to discover that the guardian of the treasure is none other than a retired hero - Kazuki’s mother! Their joyous family reunion is cut short when Hel, daughter of Loki, launches an attack. Whose family ties are stronger, and whose shall be sliced in half?!