Tokyo, 21st century.
City drown in a long recession is shocked by a series special theft crimes. The swiftest of those phantom thieves is red-haired girl Kaito Bunny the Taker.
Main character is an orphanage boy adopted by Fujinomiya family. His acquaintance with Ryoko girl from this family strangely coincides with the beginning of thefts.

[From vndbreview]