Senyoku no Sigrdrifa Episode 4 English Subbed Episode Title:Tateyama Castle Swimsuit Skirmish!.Episode Description:The 909th are battling against four Pillars, which seem to endlessly regenerate when Azuzu's plane is hit. She then passes out after she makes an emergency landing. When she awakes, she finds out that the Pillars emit ultra high frequency sound waves whenever one of them is destroyed, which she surmises is them signaling to the other Pillars to help regenerate them. However, the Valkyries learn that one of the Pillars has appeared just outside of the base, cutting them off from access to their planes. Ronge, Kinpatsu, and Gurasan overhear the conversation and offer to help take them to the base, though everybody must wear swimsuits first...