Volume 1: "Soshite Futari wa Manabisha e (And So They Arrive at School)"
Volume 2: "Irori, Rotenburo de Sosou suru (Irori Has an Accident at the Open-Air Bath)"
Volume 3: "Char and Frey, Senritsu no Bathroom (Charl, Frey, and the Bathroom of Terror)"
Volume 4: "Akabane Nadeshiko, Natsu no Yo no Yume (Nadeshiko Akabane, Midsummer Night's Dream)"
Volume 5: "Kojin Jugyou: Imishitsu de Bijo Futari to~ (Private Lesson - Two Beauties in an Infirmary)"
Volume 6: "Bishoujo Shuugou! Mizugi Darake no Daisoudou (Pretty Girls Gather! Swimsuit-Stubbed Pandemonium)"
English: Unbreakable Machine-Doll Special
Synonyms: Machine Girl wa Kizutsukanai Special, Machine-Doll wa Kizutsukanai Special
Status: Finished Airing
Aired: Dec 25, 2013 to May 28, 2014
Season: Winter 2014
Duration: 5 minutes
External Links: MyAnimeList