A one-shot that delves into Nine's past.

Boku no Hero Academia: Villain Rengou:Undercover was included in Boku no Hero Academia Vol.Rising, a limited edition booklet handed out to people who saw Boku no Hero Academia the Movie: Heroes:Rising in theaters. The one-shot was published digitally in English as My Hero Academia: League of Villains - Undercover by Viz Media on March 26, 2020.