Webour view on zenitsu changed completely in season 1, episode 12, when he killed the tongue demon with the first form of thunder breathing: In this video, we delve deep into the world of demon slayer and explore the intricacies of thunder breathing. From its origins to its depiction in the. Webthunder breathing is one such technique that zenitsu has used to great effect in the series. Of course, zenitsu is only the master of the first form, but the other. Webin demon slayer, zenitsu creating a 7th form of thunder breathing during his fight with kaigaku. Here’s how it works. Webthe mysterious power of zenitsu’s subconscious mind makes him one of the strongest characters in the series. Here’s a look at how he can fight in his sleep.