There were two teams relegated last season to the 2023 J2 League. Shimizu S-Pulse and Júbilo Iwata, both from Shizuoka Prefecture, were relegated due to them finishing 17th and 18th respectively the previous season. Thus, this is the first Japanese top-flight season to not feature any team from the region.

Kyoto Sanga finished on 16th place, but won the promotion/relegation playoffs against Roasso Kumamoto and thus retained their top league status. Had Roasso won, it would have been their first ever promotion to the top-flight.

Two teams were promoted from the 2022 J2 League: Albirex Niigata, who won the title and returned to J1 after a five-year absence, and Yokohama FC, who finished second, returning to the J1 after just a season playing on the J2 League.
From the passage provided, extract the two main changes from the 2022 and 2023 J1 Japanese football league.
After the 2022 J1 season Shimizu S-Pulse and Jubilo Iwata were relegated to the J2 league, finishing 17th and 18th respectively.  They will be replaced in the 2023 J1 season with Albirex Niigata and Yokohoma FC after finishing their J2 2022 campaign 1st and 2nd.