MINIGRAM is a non-canon comedy comic strip about the daily interactions between prisoners, which started as the First Trial came to a close.
MINIGRAM 01–17 (between Trials 1 and 2): link
MINIGRAM 18–35 (between Haruka and Mahiru's Trial 2 songs): link
MINIGRAM 36–47 (between Mahiru and Kotoko's Trial 2 songs): link
MINIGRAM 48–66 (between Trials 2 and 3): link
MINIGRAM 67 onwards (during Trial 3): link