Unbreakable Machine-Doll

OVAs to be included in the BD and DVD volume releases of Kikou Shoujo wa Kizutsukanai. Volume 1: "Soshite Futari wa Manabisha e (Then The Two Goes to Learning Dorm)" Volume 2: "Irori, Rotenburo de Sosou suru (Irori being Careless at Open Air Hot Spring)" Volume 3: "Char and Frey, Senritsu no Bathroom (Charlotte and Frey, Fearsome Bathroom)" Volume 4: "Akabane Nadeshiko, Natsu no Yo no Yume (Nadeshiko Akabane's Midnight Dream)" Volume 5: "Kojin Jugyou: Imishitsu de Bijo Futari to~ (Private Lesson: Alone In the Nurse Room with the Pretty Lady)" Volume 6: "Bishoujo Shuugou! Mizugi Darake no Daisoudou (Pretty Girls Gathered! The Great Tumult of Full of Swimming Suits)"

This risque romantic comedy story centers on Eita, an introvert mecha otaku high schooler who has a crush on the school's most popular girl Makina. When Eita finds Makina at her doorstep, he is flustered, and even more so when Makina reveals her secret: that she is a "sexaroid" robot designed for pleasure, and she is asking Eita to conduct some repairs on her discreetly. While Makina immediately tries to make a move on Eita physically, Eita struggles to contain himself, while also hiding her secret.

In this modern magic action story, Takeshi Nanase is an ordinary high school boy who has a somewhat dark past. Due to certain circumstances, he formed a "fake" couple with his childhood friend Kurumi Isoshima, but otherwise, he lives a normal life. However, one day, he comes across a girl named Mui Aiba, in a uniform he has never seen before, collapsed on the school campus. This encounter changes Takeshi's destiny completely. Mui tells Takeshi that she is a magician, and she apologizes, for she turned Takeshi into a magician, too. What Takeshi once knew as one world is actually two — the world where magicians live and the world where humans live.

During the construction of the Kurobe Dam, an ancient artifact was discovered, and so the United Nations Kurobe Research Institute was established. Intellectuals from all over the world gathered to study the object, and the children of those researchers attend Mt. Tate International Senior High School, including the institute head's daughter, Yukina Shirahane. In the summer of 2016, a lone samurai once again awakens!