Welcome to Tateyama Base (Tateyama Kichi e Yōkoso!, 館山基地へようこそ！) is the 1st episode of the Warlords of Sigrdrifa (Anime).
July 20th, 2020 in the Gulf of Alaska, a submerged lone submarine fires off a missile. At Denali Alaska, several Nighthawk and other types of airplanes fight off a giant skeletal centipede like creature. After bombing a nearby giant cerulean pillar to draw the attention of the monster; the entire Nighthawk are eliminated by red horseshoe crab creatures that spawned from the pillar. Taking into account their mission, the remaining forces try and draw away the monster, so the missile fired by the Naval Submarine, could destroy the pillar. Using its body as a shield to protect the pillar, the monster takes the missile hit and the pillar now glow bright red sends out a shock wave that destroys the remaining fleet.
A round table conference is held with official from all across the world discussing the recent failed attack on the pillar. Furthermore, the pillars that spawned all across the world within the last year is then discussed and its effects on the economic life in the world. Just then, a young boy wearing an eye patch appears on top of the table claiming to be a god. To prove his claim, the boy transforms into an adult wearing a typical magician like clothing and introduces himself as Odin, Chief of the Gods. He announces that he'll give the strength to help them defeat the grand crisis they now face and introduces his daughter a Valkyrie to help them as Ragnarök is coming.
5 years later, in June of 2025 at the Alps - Mont Blanc, a group of war planes go on the offensive against a white pillar. They're met with a swarm of creatures known as Bandits that spawn from the misty depths of the pillar. Soon a Valkyrie whose code name is Schwertleite arrives in her plane known as a "herocraft" and acts as support on Odin's behalf. With her help from the power of her magic missile called Tyrfing, however, in the end the Valkyrie is the only one left.