OVA bundled with the 14th manga volume.
Story about a joint practice session between Izuku's class and Isami High students at Yuuei Academy, takes place after the field training arc in the second season.
僕のヒーローアカデミア トレーニング・オブ・ザ・デッド; My Hero Academia: Training of the Dead My Hero Academia: Training of the Dead
