Studio Puyukai (Kaiju Girls, Lord Marksman and Vanadis, Pure Pure Purea Desu Overlord shorts) is animating the work.
Minoru Ashina (Kaiju Girls, Pure Pure Purea Desu Overlord shorts) is scripting and directing the project.
The official website for the Isekai Quartet crossover anime project began streaming a “Relay PV Overlord Version” promotional video for the anime on Saturday.
In the video, characters from the Overlord and Re:Zero franchises come across a mysterious red button that has suddenly appeared, and discuss what they think it is or does.