Yuka Ōtsubo is a Japanese voice actress and singer from Chiba Prefecture affiliated with Early Wing. In 2014, she started her career as a singer by joining the band SmileY inc. with Vocaloid musician Yuuyu-P. She also did the voice of Vocaloid character Azuki Masaoka for V4.

Vividred Operation is a Japanese anime television series produced by A-1 Pictures and directed by Kazuhiro Takamura. The series aired in Japan between January and March 2013 and is licensed in North America by Aniplex of America. Two manga adaptations have been published by ASCII Media Works. A PlayStation 3 video game adaptation by Bandai Namco Games was released in June 2013.