Valkyries are legendary female warriors that come from Asgard. They were sent to Earth, by Odin, to protect us against the growing threat of demons. The nine Valkyries pretend to be the Saotome sisters and will have to level up themselves by performing a variety of romantic acts with their official lover, Einherjar. Takuma Akutsu is a high-school student that has a menacing glare and instantly makes everyone around him run in terror because of it. Even in his earliest memories, he can remember people running away from him in fear. Such events and the loss of his mother has given him a crippling fear of people. Odin persuades him to take on the responsibility of letting the sisters stay in his big yet empty house to help them in their war against demons. With nine beautiful women sharing his roof, will Takuma manage to prevail over his fear of society and become someone worthy of saving the world.