A mysterious button that appeared suddenly one day. When it pushes it, it transfers to a different world! Truth be told I’m not sure how good this show would be but with the entertaining personalities that they are mixing together I almost want to watch just to see the interactions between the different shows.
The shows that are part of the crossover is Overload, KonoSuba: God’s Blessing in this Wonderful World, Re:Zero − Starting Life in Another World, And The Saga of Tanya the Evil, All of these titles is owned by Kadokawa. All combine they sold over 16 Million copies. and half a Million Dvds & Blu-rays. Each of these have had a promo video done in Isekai Quartet Chibi Art style.
In the year 2138, virtual reality gaming is booming. Yggdrasil, a popular online game is quietly shut down one day. However, one player named Momonga decides to not log out. Momonga is then transformed into the image of a skeleton as “the most powerful wizard.” The world continues to change, with non-player characters (NPCs) beginning to feel emotion. Having no parents, friends, or place in society, this ordinary young man Momonga then strives to take over the new world the game has become.
Kazuma Satō is a hikikomori die-hard fan of games, anime, and manga. A traffic accident brings his disappointingly brief life to an end, or it should have, but he wakes up and sees a beautiful girl who introduces herself as a goddess. She asks him if he’d like to go to another world but he can only bring one thing with him. Kazumi chooses to bring the goddess. With that, he is transported to another world and his great adventure subjugating the demon king begins, but first the hard work of finding food, clothing, and shelter begins. Kazuma wants to live in peace, but the goddess raises one problem after another, and then the demon king’s army has its eyes set on him.
Subaru Natsuki is an ordinary high school student who is lost in an alternate world, where he is rescued by a beautiful, silver-haired girl. He stays near her to return the favor, but the destiny she is burdened with is more than Subaru can imagine. Enemies attack one by one, and both of them are killed. He then finds out he has the power to rewind death, back to the time he first came to this world. But only he remembers what has happened since.
The Saga of Tanya the Evil
Tanya Degurechov used to be one of Japan’s elite office workers, but because of a wrathful god, was reborn as a little girl. She has blonde hair, blue eyes, and nearly transparent white skin, and she flies through the air and mercilessly strikes down her opponents. She speaks with a young girl’s lisp and commands the army. Tanya prioritizes optimization and career advancement above all, and she will become the most dangerous entity among the Imperial Army’s sorcerers.