Story of Phantasy Star.
The three planet Algo star system is under the democratic rule of King Lassic, who made life good as he provided everything his people could want. But slowly, over time, things began to change. It started with a new religion which was rumored to have come from another galaxy. The dark priests of this religion, never seen by any mortal, promised immortality to all who joined.
As King Lassic was getting old, the idea of living forever appealed to him, so he was the first to join. Then, he changed. It started with the threatening, evil-looking armor the priests made for him. Outrages taxes became a burden to everyone. Business on all three planets shut down and entire towns fell into decay. As time passed and the people suffered, monsters began to stalk all three worlds. When the dead came back to life, the people feared the worst and guessed the truth. Through black magic, Lassic had become an evil tyrant. Brave individuals began to rally in secret against Lassic, but his Robotcops were ruthless in hunting out these defenders of the people. One was Nero, a spaceport worker in Camineet, the central town on the planet Palma. Long ago, his father had disappeared trying to learn Lassic's evil secrets.
In the year AW 342, Nero was caught and killed by Robotcops. As he lies dying of his wounds, he passed on his short sword to his young sister, Alis, and asks her to take up his quest to rid Algo of Lassic's evil. He suggests her to seek out the legendary warrior Odin for help. Alis, saddened by the death of her brother, vows to avenge him.
Alis sets out to find Odin, but finds that he has been turned to stone by Medusa while trying to capture her mythical axe to use to fight Lassic. Learning that a medicine called Alshline can restore him, she sets off to find a talking animal said to have some hanging from its neck. Journeying to the second planet of Algo, Mota, she finds the store where the talking animal was sold, and after paying with the Laconian Pot from Nekise, Myau joins the party. From here, the two return to Palma and venture to Medusa's Cave, where Odin's stone form currently sits. Once they find him, Alis uses the Alshline to revert the curse, and Odin, who tells them he has stashed a Compass elsewhere in the cave, joins the party.
Later Noah joins the party, and the four defeat Lassic.