Season 3

Yatogame-chan Kansatsu Nikki Sansatsume (『八十亀ちゃんかんさつにっき 3さつめ』; Yatogame-chan Observation Diary Second Season) is the third season of the anime adaptation. Season 3 aired from January 10, 2021 to March 28, 2021.

Characters
Monaka   Kaito    Yanna    Mai Toshika   Rin    Lala    Teppei Shiharu   Nanaho    Serura    Tsuji
 * Main
 * Monaka Yatogame (八十亀 最中, Yatogame Monaka) portrayed by Haruka Tomatsu
 * Kaito Jin (陣 界斗, Jin Kaito) portrayed by Mitsuhiro Ichiki
 * Yanna Sasatsu (笹津 やん菜, Sasatsu Yanna) portrayed by Mikako Komatsu
 * Mai Tadakusa (只草 舞衣, Tadakusa Mai) portrayed by Yūki Wakai
 * Supporting
 * Recchiri-sensei (レッチリ先生, Rekkiri sensei) portrayed by Tetsu Inada
 * Toshika Jin (陣 繁華, Jin Toshika) portrayed by Hisako Tōjō
 * Lala Shonai (初内 ララ, Shonai Rara; S2) portrayed by Yoshino Nanjō
 * Rin Jandara (雀田来 鈴, Jandara Rin; S2) portrayed by Eriko Matsui
 * Teppei (鉄平, Teppei; S2) portrayed by Kenji Akabane
 * Shiharu Itenmae (一天前 紫春, Itenmae Shiharu; S2) portrayed by Honoka Kuroki
 * Nanaho Koshiyasu (輿安 七帆, Koshiyasu Nanaho; S3) portrayed by Ayasa Itō
 * Serura Dobe (土辺 世瑠蘭, Dobe Serura; S3) portrayed by Maria Naganawa
 * Masahide Tsuji (辻 優秀, Tsuji Masahide; S3) portrayed by Junji Majima