Isekai Quartet

Isekai Quartet (異世界かるてっと, Isekai Karutetto) is a Japanese anime series that serves as a chibi-style crossover between the series KonoSuba, Overlord, Re:Zero − Starting Life in Another World, Saga of Tanya the Evil and The Rising of the Shield Hero, all published by Kadokawa Corporation. It first aired on the 9th April 2019.

A Season 2, titled Isekai Quartet 2, was announced on October 5, 2019, and was released on January 14, 2020, adding characters from The Rising of the Shield Hero as protagonists. A third Season was announced at the end of Season 2. The series first theatrical production, Isekai Quartet The Movie -Another World-, was announced on July 6, 2021 and set to be released in 2022.

The series is produced by Kadokawa, with Studio PuYUKAI on animation. The official site is isekai-quartet.com.

Synopsis
One day, a magic button suddenly appears. The protagonists from KonoSuba, Overlord, Re:Zero − Starting Life in Another World, and Saga of Tanya the Evil all press the button occasionally, unintentionally and move to a parallel world — another brand new Isekai — where a new story featuring high school life begins. Soon, they are joined by protagonists from The Rising of the Shield Hero with cameos from the Cautious Hero: The Hero Is Overpowered but Overly Cautious series. With no way of escaping, the characters must lead a normal school life and make acquaintances with the others. One thing is certain: the classroom full of fan-favourite eccentric personalities never gets boring!

Episodes

 * Season 1


 * Season 2


 * Season 3

Theme Songs

 * Opening Season 1 : Isekai Quartet (song)
 * Ending Season 1 : Isekai Girls Talk
 * Opening Season 2 : Isekai Showtime
 * Ending Season 2 : Defective! Isekai Theater

Isekai Quartet Adventure! Action Game (2021)
'''Isekai Quartet Adventure! Action Game''' (異世界かるてっと　冒険！あくしょんげーむ) is a single-player video game produced by Gotcha Gotcha Games for the Nintendo Switch. It was released on June 17, 2021 and available online for download.

Isekai Quartet The Movie -Another World- (2022)


Isekai Quartet The Movie -Another World- (異世界かるてっと ~ あなぎーあーるど ~) is an upcoming movie based on the anime crossover series Isekai Quartet series. The movie is scheduled to be released in 2022.

Staff and Cast
The cast of the original series have come to voice their respective characters on Isekai Quartet. Asini Minoru is the director/screenwriter; Takahara Minoru is the character designer and general director.

Trivia

 * Overlord (ぷれぷれぷれあです, en: Pure Pure Pleiades), Re:ZERO (Re:プチから始める異世界生活, en: Re: PETIT ~Starting Life in Another World from PETIT~), and Youjo Senki (ようじょしぇんき, en: Youjo Shenki), all have their own separate chibi series: the staff who made these worked together on Isekai Quartet.