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?

Teru and Kurosaki finally get ahold of "M's Last Testament," and they discover the truth behind their nemesis Akira's past! While Teru opposes helping Akira with his current predicament, Kurosaki is forced to investigate further...with dire consequences for the both of them!