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?

While trying to uncover who the fake DAISY is, Kurosaki gets injured protecting Teru from an attack! The near-fatal incident leaves Teru shaken, and she vows to stay close to Kurosaki. But is proximity just going to hurt them both with the truth still veiled?