"Sister's Log: Moyako's Never-ending Monologue") is a Japanese manga series written and illustrated by Kenji Taguchi.

A three-episode original video animation (OVA) produced by Brain's Base was released from September 2014 to April 2015.

[22] A fan disc, which included a six-episode flash anime and three short special episodes, was released on April 18, 2014.

[23][24] An original video animation (OVA), produced by Brain's Base and directed by Tetsuo Ichimura, with scripts by Natsuko Takahashi and character designs by Eriko Itō, was bundled with the limited edition of the fifth manga volume on September 16, 2014.

[26][17] In June 2021, Sentai Filmworks announced that they licensed the OVAs for digital and home video releases.