Isekai Quartet TV Anime's 2nd 'Relay' Promo Video Previews Re:Zero, Konosuba Characters

The official website for the Isekai Quartet crossover anime project began streaming a new "Relay PV Re:Zero Version" promotional video for the anime on Sunday.
The video features characters from both the Re:Zero and Konosuba - God's Blessing on This Wonderful World! franchises. The video continues where the previous video left off after Rem and Ram find a strange red button. Emilia tells Subaru about Rem and Ram's encounter, and he tells everyone not to touch the button or they'll be sent to a strange world. Next, the red button shows up in the world of Konosuba.

The anime will premiere in spring 2019, and will be a crossover anime featuring characters from the Overlord, Konosuba - God's Blessing on This Wonderful World!, Re:ZERO -Starting Life in Another World-, and Saga of Tanya the Evil franchises. The anime will feature the characters in super deformed form.

Minoru Ashina (Kaiju Girls, Pure Pure Purea Desu Overlord shorts) is scripting and directing the project. Minoru Takehara is serving as both character designer and chief animation director. Studio Puyukai (Kaiju Girls, Lord Marksman and Vanadis, Pure Pure Purea Desu Overlord shorts) is animating the work.

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.

Kadokawa stated in the anime's announcement that all four franchises together have more than 16 million book copies in print, and more than 500,000 combined Blu-ray Disc and DVD sales totals. All four light novel series are in the "isekai" (another world) genre, and each has inspired manga and anime adaptations.

Source: Isekai Quartet anime's website, Kadokawa Anime's YouTube channel