That Time I Got Reincarnated as a Slime Debuts Season 2 Opening, Ending That Time I Got Reincarnated as a Slime has finally made its grand return for its second season, and this means it has debuted a brand new set of opening and ending theme sequences! Originally scheduled to make its debut last Fall before being delayed due to the ongoing COVID-19 pandemic (like many of the other major releases of the Winter 2021 season, actually), That Time I Got Reincarnated as a Slime is one of the most anticipated returns of the year overall. It's no mystery as to why as the world around Rimuru is getting even bigger in the new season.