9 episodes
First episode: E1
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Quick answers about this series, release status, and episode totals.
When did 21 cm first air?
21 cm first aired on May 9, 2016.
How many seasons and episodes does 21 cm have?
21 cm currently has 1 season and 9 episodes.
When is the next episode of 21 cm?
21 cm is ended, and no upcoming episode is currently scheduled.