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Nōnai Poison Berry is a Japanese slice-of-life romance manga series written and illustrated by Setona Mizushiro. It was serialized in Chorus magazine, later relaunched as Cocohana magazine, from December 2009 to March 2015 and collected as five tankōbon volumes by publisher Shueisha. The series was adapted into a live-action film that premiered in Japan in May 2015, as well as a stage play that ran at the New National Theatre, Tokyo, in March 2020, both directed by Yūichi Satō and officially titled Poison Berry in My Brain in English. The Stage play was rerun in 2022 with a different cast.