Rhoma Grace, Wandering Star, was sent to Scorpio to discus tracking technology to try and find the Marad. The Marad is a terrorist group of Risers, people who change their zodiac signs, who attack the other constellations and cause world wide panic. Rho and her friends try to stop the Marad, find the Master, and end all of the chaos.
Rhoma Grace, Stanton Grace (Rho's Brother), and Mathias Thais were on Scorpio for political business when Rho's best friend calls saying she needs her help.
(Mathias) I can't believe someone thought we stole something from the Scorpio's
(Stan) Where are we headed anyways?
(Rho) Well we are on our way to the Aquarius constellation so we can help Nishi.
(Rho) Stan believes that one of the sponsors isn't who they think they are, and I have a feeling he is right.
(Nishi) Well I don't know Rho, I have been here for a while and no one has seemed suspicious to me.
Rho and her friends attend a social event on Aquarius, where Stanton believes that someone isn't who they are supposed to be, and Rho meets up with an old friend to help her solve the mystery.
(Rho) I can still save everyone and bring peace to the Zodiac, Crompton!
(Crompton) You foolish child, you cannot save the zodiac from me! I will bring back House Ophiuchus.
Then Rho goes to Pisces with her friends and finds her mystery killer. Ambassador Crompton was behind the Marad, the sickness spreading through Pisces, and the destruction of Cancer, Rho's home. Rho is able to save the Guardians of the other houses, but sacrifices her mom and brother at the same time.