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 her friends sneak aboard a yacht in order to save Rena and foil Morizono's plan to sell the new "Jack Frost" virus. The rescue mission turns out to be more than anyone bargained for, however, when Kurosaki runs into a man who makes his blood turn cold...