The Interplanetary Alliance, which united the inhabitants of the Earth and their allies, collided at the far reaches of the galaxy with an alien and hostile race - the bloodthirsty Halians, who regularly carry out pirate raids on outlying planets. Only the combat Fleet of the Alliance can repel the ruthless pirates. No one is talking about war yet. No one has yet been called an enemy. So far there is only vague information about attacks on distant planets, and occasionally missing starships. Yuriko is a member of the search party. She manages to find her brother's destroyed ship, and grief forces her to continue the search, but now her goal is the pirates' home world.