The actors have arrived ─ an ill young man who is a swordsman and druggist. A suspicious poet has perfect appearance. A girl wants to kill the young man from an assassination group. The stage has been prepared ─ the world, that has come to an end one time and revived due to a man who has been called “the World King” and the God who has bird’s appearance. For deadless, living and persuading love, they start a long journey. Oh, eternita, thus raises the first act! (From Baroque Garden LJ)

Note that each volume has a different title:

Volume 1: Opera・Eternita - The World sings forever Volume 2: Opera・Cantante - The Silent Singer Volume 3: Opera・Fiore Volume 4: Opera・Eliso Volume 5: Opera・Labyrinth Volume 6: Opera・Gloria Volume 7: Opera・Memoria Volume 8: Opera・Aurora