Rejoiced fans of isekai anime cuz 4 big hit Isekai anime franchises is getting a crossover anime in spring 2019. On Saturday, Isekai Quartet crossover anime project officially announced on its website and posted a Relay promotional video featuring characters from the Overlord and Re: Zero franchises. In PV, suddenly a mysterious red button has appeared before them and talking what it might be and where’d it come from.

Relay PV featuring characters from the Overlord and Re: Zero franchises:

This crossover anime is featuring Overlord, Konosuba – God’s Blessing on This Wonderful World!, Re: Zero -Starting Life in Another World-, and Saga of Tanya the Evil anime. The anime will feature characters from all the respective anime. Minoru Ashina is directing and scripting the project. Minoru Takehara is serving as character designer and chief animation director. Studio Puyukai is producing this anime crossover.

Plot:

In the anime’s story, a mysterious button suddenly appears one day, and characters who press it are taken to a new world to gather.

Aura Bella Fiora and Mare Bello Fiore from the Overlord
Ram and Rem from Re: Zero

In the anime PV’s Kadokawa also stated that all four franchises collectively have more than 16 million book copies in print and the total sales of more than 500,000 combined Blu-ray Disc and DVD. All four light novel series is in the “isekai” (another world) genre, and each has inspired manga and anime adaptations.

Those of you who are unfamiliar with the genre, “Isekai” is a reference to a situation in which characters find themselves transported to an alternate dimension or universe. Marooned in an unfamiliar place, characters have to display exceptional adaptability in order to survive long enough to find a way back to the world from whence they came.