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Yaji had never imagined that the definite evidence indicating the existence of aliens in the universe would be so grand and tragic. Mercury's surface material was suddenly and regularly thrown into space, forming a ring with a diameter of tens of millions of kilometers around the sun, like a shining ring. However, as the width continues to increase, the ring actually takes away the sunlight that should be shining on the earth, putting human civilization into an unprecedented crisis. Who built the circle? Are they here to usurp the sun? Aki resolutely decided to join the investigation team, board the ring in person, and solve the mystery. But Aki doesn't know that a battle between humans and sun usurpers has begun, and she will devote her life's energy to this, and even more...