The December issue of Gessan magazine has announced that Souichirou Yamamoto's manga Ashita wa Doyoubi will get a TV anime adaptation. The anime will broadcast within Karakai Jouzu no Takagi-san, which is slated for Winter 2018. The cast members have also been announced.

Cast
Mina: Konomi Kohara (Mahoujin Guruguru (2017))
Yukari: Mao Ichimichi (M.A.O) (Action Heroine Cheer Fruits)
Sanae: Yui Ogura (UQ Holder!: Mahou Sensei Negima! 2)
Nakai: Yuuma Uchida (Macross Δ)
Mano: Kotori Koiwai (the Non Non Biyori series)
Takao: Nobuhiko Okamoto (Juuni Taisen)
Kimura: Fukushi Ochiai (Hai to Gensou no Grimgar)
Tanabe-sensei: Hinata Tadokoro (Owarimonogatari)

Ashita wa Doyoubi is a spin-off manga of Karakai Jouzu no Takagi-san that was serialized between November 2014 and November 2015 in Yomiuri Chuu Kousei Shinbun, a weekly newspaper for junior and senior high school students. Shougakukan's Gessan Shounen Sunday Comics published the series into two compiled volumes. The manga features three girls: Mina, Yukari, and Sanae as the main characters and sets in the same junior high school as the main series, which also features Takagi and Nishikata.

Source: Comic Natalie