On July 30th, 2021, Mechanical Girl released a press release revealing the final boxart and release date for Rei. The goal this time was set to 3.5 million yen and once again surpassed it at ¥4,547,039 form 256 backers. Unlike the previous UTAU voicebank which is capable of singing, this voicebank would be capable of speech. On March 9th, 2021, a new CAMPFIRE campaign went up this time for a A.I.VOICE voicebank. Her UTAU voicebank was finally completed and released on October 12, 2019. The parts for her robot were digitally modeled and 3D printed. The samples were modified in Audacity to create a more genuine robotic, choppy, and low-quality artificial sound. Rei's voice would be modified from various digital synthesized samples to create a voicebank capable of singing in Japanese. To go with the robot, a singing voicebank was to be created for UTAU. The rewards for backing were set to be sent out in December 2021. The goal was set for 3 million yen and surpassed that goal hitting a total of ¥3,596,499 from 184 backers. On February 15th, 2017, a CAMPFIRE crowdfunding campaign was launched to help fund the construction of the robot. After successfully building a life sized Hatsune Miku robot, missile39 went on to create their own original character robot. In 2017, production was started on creating Adachi Rei. Adachi Rei is set to be a life-sized bishoujo robot.

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