I think the first team to be relegated from the Bundesliga is Holstein Kiel. They are a very weak team, especially their defensive line is very weak, they concede a lot of goals in their goal. They lost 2-4 in front of Frankfurt in the match that just ended.
They got 1 point ahead of Bochum last week, but Bochum is also a weak team. If they continue like this, they won't even get 15 points until the end of the year.