The Tokyo High Court ruled Miyazaki sane, stating that "the murders were premeditated and stemmed from Miyazaki's sexual fantasies" and he was executed by hanging for his crimes on June 17, 2008.
Tokyos højesteret fastslog at han ikke var sindsyg og erklærede, at "mordene var overlagt og skyldtes Miyazaki's seksuelle fantasier", og han blev henrettet ved hængning for sine forbrydelser den 17. juni 2008.