Isekai Quartet is a seemingly unlikely series that’s actually happening, which is reason enough to be excited about its spring 2019 premiere date. The series is a crossover anime featuring puchi-chara versions of characters from some of the most popular isekai (another world) series, including the Overlord light novels, Re:ZERO -Starting Life in Another World-, KONOSUBA, and The Saga of Tanya the Evil.
If you’ve gotta see it to believe it, you’re in luck. The teaser site shared the first 60-second promo for the series, with characters from Overlord on full display along with Rem and Ram from Re:ZERO.
Overlord edition promo:
Here’s the very simple setup, via Crunchyroll:
One day, a mysterious button suddenly appears. By pushing it, they are transported to another different world!! The characters from another worlds gather there, too…!?