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Yatogame-chan Kansatsu Nikki (八十亀ちゃんかんさつにっき, lit. "Yatogame-chan Observation Diary") is a manga series by Masaki Andou. It is serialized in Comic REX. An anime adaptation was announced in the fourth volume of the manga on May 26, 2018. The television series is directed by Hisayoshi Hirasawa, with animation by studio Saetta and Creators in Pack. Satsuki Hayasaka is the character designer. Creators in Pack is credited with the animation cooperation. The series premiered on April 4, 2019, ran for 12 episodes until Jun 20, 2019, and was broadcast on TV Aichi and Tokyo MX. On the day of the season 1 finale, a season 2 was announced to be in the works by the same studios and also ran for 12 episodes from January 5, 2020 to March 22, 2020.