After the pirate ship sank and Giler died, great sorrow and pain tormented Sereness.  It is said that Sereness acquired the Harp of Dreams from a sea witch to erase her own memory.  However, after erasing Giler from her memories seven times, she remembered him against seven times.  Memories may be erased, but love is etched on ones heart, never to be erased.  Sereness sorrow continued on ever since.