Kemeko Deluxe!
Kemeko DX ／ Kemeko DX! ／ Kemeko-DX ／ The Unknown Girl Friend ／ The Unknown Girlfriend ／ kdx! ／ けめこでらっくす ／ ケメコデラックス! ／ ケメコデラックス！ ／ 钢铁新娘
Description
The story centers on a typical high school boy and a super-deformed, doll-like robot that suddenly appears in his bedroom. The robot declares itself to be the boy's wife, and only then does a beautiful girl emerge out of the robot's mouth. The girl turns out to be someone who was promised the boy's hand in marriage ten years earlier. (Source: Anime News Network)