Koro-sensei's memory is a lie, and he knows it. This ten-minute special does what the show does best: it lets you laugh at the gap between how a teacher wants to be remembered and what actually happened, then pulls the rug out with the truth. For fans who already love the dynamic between Koro-sensei and Karasuma, it's a perfect reminder of why their relationship works, they're both too ridiculous to stay enemies for long.

Koro-sensei looks back on the first time he met Karasuma. As he tells it, the two clashed from the start and fought each other, and by the end each had earned the other's respect. Karasuma eventually sets the record straight: the meeting that really happened was nowhere near that dramatic. This single-episode special, numbered episode 0 of the TV series, was shown at the Jump Festa 2014 events and later appeared as an extra on the first Blu-ray and DVD volume. It mixes action and comedy in the gap between the story Koro-sensei tells and what actually took place.