The official Website of The Rising of The Shield Hero announced on July 8, 2021 that the season 2 of the anime will not be releasing in October 2021 as it was originally planned.
Instead, it will be broadcasted in April 2022.
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We do not know the reason as to why it is getting delayed. You can read the original notice that the official website of The Rising of the Shield Hero posted below.
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Rising of the Shield Hero Postponed
“Due to various reasons, we have decided to postpone the broadcast of “The Rising of the Shield Hero” Season 2, which was scheduled to be broadcast from October 2021.
Currently, we are planning to broadcast from April 2022, so when the detailed date and time are decided, we will inform you on the official website.”

background
The Rising of the Shield Hero was originally a light novel written by Aneko Yusagi. It was published on a web novel site named “Shosetsuka ni Naru” as a web novel. A total of 22 volumes for the web novel have been published.
It was soon adapted into a manga series by Aiya Kiyu. A total of 17 volumes have been released as of November 2020. The manga series got its anime adaptation in 2019 and aired from January 2019 to June 2019. The anime had a total of 25 episodes and was produced by Kinema Citrus.

Storyline
Naofumi Iwatani is a shut-in Otaku with no friends. One day, Naofumi gets transported to a Fantasy World along with 3 other boys. Apparently, the four of them were summoned as the four Cardinal Heroes to serve the Kingdom of Melromarc.
They are supposed to fight some monsters that come from a dimension in the form of waves.
The other three heroes received a spear, a sword and a bow as their weapons. However, Naofumi received a shield. The shield was not considered a very powerful equipment and he did not get as much grace as the other heroes did.
On top of it, Naofumi got wrongly accused of sexual assault by Malty, the princess of Melromarc. He was then banished from the Kingdom.
Naodumi decided to start over his journey from the start and formed a party with a demi-human, Raphtalia and a Filolial, Filo.
Now, he must clear his name and prove that he’s equal to the other legendary heroes with the help of his party members.
