After orphan Teru Kurebayashi loses her beloved older brother, she finds solace in the messages she exchanges with DAISY, an enigmatic figure who can only be reached through the cell phone her brother left her. Meanwhile, mysterious Tasuku Kurosaki always seems to be around whenever Teru needs help... Could DAISY be a lot closer than Teru thinks?

The past continues to haunt Teru and Kurosaki when they're given a chance to find the mysterious "M's Last Testament." Unfortunately, their savage nemesis Akira has his eyes set on finding it too! Will Akira beat them to the punch? Or does Teru have something up her sleeve?