Anzu Murata sneaks into the Mitarai household under the guise of a housekeeper, suspicious that the second woman her father married, Makiko, was the culprit behind the fire 13 years ago - a fire for which her mother was labeled the criminal behind its outbreak. After overcoming many dangers, getting Makiko cornered is finally within sight...but it turns out the real culprit is someone else! After experiencing betrayal after betrayal, just what is the truth behind the fire?