Isekai Quartet

Isekai Quartet (異世界かるてっと) is a Japanese anime series that serves as a chibi-style crossover between the light novel series KonoSuba, Overlord, Re:Zero, and The Saga of Tanya the Evil, all published by Kadokawa Corporation. The series aired its first season from April to June 2019. A second season aired from January to March 2020, including additional characters from The Rising of the Shield Hero and Cautious Hero: The Hero Is Overpowered but Overly Cautious. An anime film titled Isekai Quartet: The Movie – Another World was released in June 2022. A third season has been announced.

Premise
One day, a magic button suddenly appears. The protagonists from KonoSuba, Overlord, Re:Zero, and The Saga of Tanya the Evil all press the button occasionally, unintentionally and move to a parallel world &mdash; another brand new isekai &mdash; where a new story featuring high school life begins. Soon, they are joined by protagonists from The Rising of the Shield Hero and Cautious Hero: The Hero Is Overpowered but Overly Cautious.

Production and release
The series is written and directed by Minoru Ashina, with character designs by Minoru Takehara, who also serves as chief animation director. The series is animated by Studio Puyukai. It aired from April 9 to June 25, 2019. The series ran 12 episodes. Funimation (now Crunchyroll, LLC) has licensed the series and is streaming it in both Japanese and English. On April 23, 2019, it was added to Crunchyroll's streaming library as well. Satoshi Hino, Jun Fukushima, Yūsuke Kobayashi and Aoi Yūki perform the opening theme song "Isekai Quartet" (異世界かるてっと), while Yumi Hara, Sora Amamiya, Rie Takahashi and Aoi Yūki perform the ending theme song "Isekai Girls Talk" (異世界ガールズ♡トーク).

A second season of the anime series was announced at the ending of Episode 12 and premiered on January 14, 2020. The main staff members returned to reprise their roles. The season includes guest appearances of characters from The Rising of the Shield Hero. Hino, Fukushima, Kobayashi and Yūki perform the second season's opening theme song "Isekai Showtime" (異世界ショータイム), while Sumire Uesaka, Rie Takahashi, Inori Minase, and Saori Hayami perform the second season's ending theme song, "Ponkotsu! Isekai Theater" (ポンコツ!異世界シアター). The second season ran for 12 episodes. Funimation has licensed the series for a simuldub. Crunchyroll is also streaming the second season. Muse Communication is streaming the second season in Southeast Asia and South Asia on its Muse Asia YouTube channel.

A sequel to the anime series was announced at the ending of the second season's final episode. A new anime film has been announced, with the returning staff and cast. The film premiered on June 10, 2022. The film's theme song is "Melodic Road Movie" by Konomi Suzuki featuring Kashitarō Itō.

A side-scrolling action game, Pixel Game Maker Series Isekai Quartet: Adventure Action Game, has been released for Nintendo Switch and Steam on July 17, 2021.

Reception
Gadget Tsūshin listed "beautiful Megumin" in their 2019 anime buzzwords list.