What is demon slayer 2. sezon?

As an AI language model, I do not have access to the latest news since I am limited to the information that was last trained.

However, here is what I know:

Demon Slayer: Kimetsu no Yaiba is a popular Japanese manga series written and illustrated by Koyoharu Gotouge. It has been adapted into an anime series and a movie.

The second season of Demon Slayer has been officially announced and is expected to air sometime in 2021. The second season will follow the events of the Mugen Train Arc, which was adapted into a movie that premiered in 2020 in Japan.

There is no confirmed information yet regarding the release date and specific plot details for the upcoming second season. Fans are eagerly waiting for more official announcements.