Shuusou no Refrain

is a Japanese light novel series written by Junpei Monogusa, with illustrations by Fuji Choco. The series began publication on March 10, 2017 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
A world where a special music box that manipulates "gravitons" and its stylish humanoid machine "singing doll (ordor)" have become popular and finally "electrically separated".

One day, I met a broken boy engineer / task who "only loves machines".

"I am Galatea Sisters No.VII / Refrain. From this time on, I am your" bride "."

A beautiful singing doll refrain that claims to be the singing doll technology and the out-of-place art that started it. Things start to move around it. Those who chase, those who are chased, and those who fall in love.

"Singing dolls that are too close to humans" and "boys who can only love machines". The love weaving between humans and dolls that are not humans will eventually change the world-- !?