ゴッド・スレイヤー はるか天空のソナタ/ Crystalis

You must save the world from evil magic by finding the four powerful swords that form Crystalis. After the apocalypse, magic returns to Earth. A blessed group of good-intentioned sorcerers have used their new magical powers to rebuild the Earth, but an evil sorcerer named Dragonia has combined his supernatural forces with man-made technology to devastate the rebuilt Earth. It is your mission to recover four mystical swords, and combine them to form the ultimate blade: the Sword of Crystalis. This legendary weapon is the only tool which can put an end to Dragonia's black reign.

In the year 199X, mankind collapsed civilization by its own hand. To atone for their mistake, people built a tower high in the sky. They hoped that their hearts would not be ruled by demons again. One hundred years later, the earth is ruled by monsters, and the people are living in fear, but they are still living together, dreaming of the return of peace. The basis for this hope is the legend of a savior that has been passed down from generation to generation.