Kamen Byoutou (2020)

Similarities:
-The female leads are played by the same actress in both 3 Nen a Gumi and Mask Ward
-Both stories are centered around a hostage situation gone wrong.
-Both stories have a theme of revenge and justice.
-Both deal with controversial topics
Differences:
-3 Nen a Gumi takes place in a classroom, and Mask Ward takes place in a mental institution/nursing home.
- 3 Nen a Gumi is about the suicide of a classmate meanwhile Mask Ward deals with corruption inside the institution.
- 3 Nen A Gumi deals with the corruption in society whereas Mask Ward deals with political and medical corruption.
I recommend both the drama and film if you enjoy a good mystery and psychological thriller.

Shugo Hayami is a doctor at a nursing hospital, which was once a psychiatric hospital. One evening, when Shugo Hayami is on night duty, a man in pierrot mask breaks into the hospital and he is not alone. He is with Hitomi Kawasaki. She is a university student and she has been shot by the masked man. The masked man tells Shugo Hayami to treat Hitomi Kawasaki. He also takes hostage the 64 people in the hospital. Soon, Shugo Hayami and Hitomi Kawasaki try to escape from the hospital and they encounter mysterious cases one at a time.

Shugo Hayami is a doctor at a nursing hospital, which was once a psychiatric hospital. One evening, when Shugo Hayami is on night duty, a man in pierrot mask breaks into the hospital and he is not alone. He is with Hitomi Kawasaki. She is a university student and she has been shot by the masked man. The masked man tells Shugo Hayami to treat Hitomi Kawasaki. He also takes hostage the 64 people in the hospital. Soon, Shugo Hayami and Hitomi Kawasaki try to escape from the hospital and they encounter mysterious cases one at a time.

Shugo Hayami is a doctor at a nursing hospital, which was once a psychiatric hospital. One evening, when Shugo Hayami is on night duty, a man in pierrot mask breaks into the hospital and he is not alone. He is with Hitomi Kawasaki. She is a university student and she has been shot by the masked man. The masked man tells Shugo Hayami to treat Hitomi Kawasaki. He also takes hostage the 64 people in the hospital. Soon, Shugo Hayami and Hitomi Kawasaki try to escape from the hospital and they encounter mysterious cases one at a time.

Shugo Hayami is a doctor at a nursing hospital, which was once a psychiatric hospital. One evening, when Shugo Hayami is on night duty, a man in pierrot mask breaks into the hospital and he is not alone. He is with Hitomi Kawasaki. She is a university student and she has been shot by the masked man. The masked man tells Shugo Hayami to treat Hitomi Kawasaki. He also takes hostage the 64 people in the hospital. Soon, Shugo Hayami and Hitomi Kawasaki try to escape from the hospital and they encounter mysterious cases one at a time.

Shugo Hayami is a doctor at a nursing hospital, which was once a psychiatric hospital. One evening, when Shugo Hayami is on night duty, a man in pierrot mask breaks into the hospital and he is not alone. He is with Hitomi Kawasaki. She is a university student and she has been shot by the masked man. The masked man tells Shugo Hayami to treat Hitomi Kawasaki. He also takes hostage the 64 people in the hospital. Soon, Shugo Hayami and Hitomi Kawasaki try to escape from the hospital and they encounter mysterious cases one at a time.