In Labyrinth City Orario, everyone is celebrating an old festival called "Shingetsusai". Adventures Bell Cranel, with the alias 'Little Rookie", and his Goddess, Hestia, are also enjoying it. At the same time, the Goddess Artemis is searching a champion in order to counter a new threat in the ruins of an ancient city. Unexpectedly, Bell, a newbie adventurer partnered with a low-tier Goddess, is the one she chosen because he extracted the legendary arrow. To finish Artemis' mission, a new adventure begins!