Isekai Yakkyoku/Parallel World Pharmacy is listed for 12 episodes according to BD/DVD listings : r/anime

Light Novel Volume 09, Isekai Yakkyoku Wiki

Isekai Yakkyoku - Episode 1 discussion : r/anime

No of Disc 2 Discs (12 Episodes).

Isekai Yakkyoku / Parallel World Pharmacy Vol.1-12 END Anime DVD [Free Gift]

Isekai Yakkyoku - Episode 12 discussion - FINAL : r/anime

Isekai Yakkyoku/Parallel World Pharmacy is listed for 12 episodes

Isekai Yakkyoku/Parallel World Pharmacy is listed for 12 episodes

2022 Anime, Seasonal Chart

2022 Anime, Seasonal Chart

Isekai Yakkyoku / Parallel World Pharmacy Vol.1-12 END Anime DVD

Parallel World Pharmacy (Anime) –

2022 Anime, Seasonal Chart

Parallel World Pharmacy - The Complete Season - Blu-ray

Kadokawa Schedules 'Isekai Yakkyoku' Anime DVD/BD Releases

Magic – Anime2Enjoy