Original animation to be included in the BD and DVD volume releases of Machine-Doll wa Kizutsukanai.
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)"
(Source: MAL)
Special episode included in the second Blu-ray/DVD volume.
The story follows the two titular girls Escha and Chron, whose contrasting personalities are like the sun and moon. The two girls are from Terminal, a future post-apocalyptic world that's empty and monochrome. The two girls cross worlds and arrive in the present day, which they call Transit. As Escha and Chron experience the light (scenery) and sound (music) of the real world, the future world of Terminal gradually changes into a more vivid world.
(Source: Anime News Network)
It is a tasuketsu (multiple choice) drama split into 3 separate stories featuring the three primary trios: Kino/Hermes, Shizu/Ti/Riku and Shishou/Aibou with multiple options to choose from throughout their stories, however, all three focus on the travelers of choice venturing into the Country of Ruins and meeting the lone citizen Sera.
In the suburbs of Tokyo, a group of six girls have played together at the park since they were little, but eventually have to switch schools. Before they leave, they plan to make a time capsule, but are unable to do so. The story follows the girls four years later as they meet again.
(Source: Anime News Network)