- Relationship Voice Actor: Hiro Shimono and Hitomi Harada, the voices of leads Raishin and Yaya, previously portrayed the leads of Baka and Test: Summon the Beasts, Akihisa Yoshii and Mizuki Himeji.
- It went as far as to the personalities of both characters. Yaya is one of the best made automatons while Raishin is one of the bottom ranked puppeteers in the school. And Yaya is a yandere and can be forceful in their relationship, just like Mizuki.
Trivia / Unbreakable Machine Doll