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Fleeing in a spaceship from her home planet of Valhalla, Princess Warukyure (Valkyrie) has crash-landed on the unlucky Kazuto and his public bathhouse. In order to save him from death, she has given half of her soul to Kazuto, binding them together irreversibly.
With only half her soul, unless she borrows power from Kazuto, Waru-chan reverts to the form of a child. For Kazuto's part, he's now basically invulnerable, which is a lucky thing considering all of the explosions, death rays, and crashing spaceships that are now a commonplace occurrence. Will Kazuto's bathhouse, friends, and city be able to survive being mixed up in Waru-chan's royal family drama?