NG Code Poisoning

NG Code Poisoning is an execution featured in Danganronpa 3: The End of Hope's Peak Academy - Side: Future, with Daisaku Bandai, Sonosuke Izayoi, Koichi Kizakura, and Kyoko Kirigiri being executed individually.

Sequence
The execution is tied to the Monokuma bangles worn by participants of the Final Killing Game; specifically, to the NG Codes (or Forbidden Actions) displayed by each one. If a participant violates their NG Code, the bangle detects this and injects a fast-acting poison into the violator's bloodstream, indicated by a small electronic jingle.

The poison rapidly spreads through the victim's body, turning the left side of their body dark purple. Their blood vessels become engorged, particularly in the left eye, which turns red and begins "crying" blood as a result of the increased pressure. The victim usually dies moments later.

It was later revealed that Seiko Kimura had created a drug that allowed those who took the medicine before being poisoned to enter a near-death, coma-like state instead of dying upon injection of the poison. Kyoko Kirigiri was thus able to survive by taking the drug and suffered from no side effects after being revived by Mikan Tsumiki.

Trivia

 * This is the second execution to be used against more than one person, following After School Lesson from the original Danganronpa. It is also the first execution to be canonically used against multiple individuals.
 * Victims of NG Code Poisoning bear a certain resemblance to Monokuma, having a darkened left side and a red left eye as a result of the poison.
 * Koichi and Kyoko willingly triggered their NG Codes by performing these sacrifices: Koichi directly violated his NG Code to save Kyoko from certain death and Kyoko herself deliberately concealed her code from her friends to ensure that Makoto Naegi wouldn't act recklessly to try and save her.