Isekai Quartet (異世界かるてっと) is an anime crossover spin-off that first aired on April 9, 2019. It is a crossover anime series that consists of characters from four major light novel works that boast a cumulative total of over 16 million copies in the total series, and boasting a total sales of more than 500,000 BD & DVD series: Youjo Senki, Kono Subarashii Sekai ni Shukufuku wo! (この素晴らしい世界に祝福を！), Re:Zero kara Hajimeru Isekai Seikatsu (ゼロから始める異世界生活), and Overlord (オーバーロード).
The series is produced by Kadokawa and the studio in charge of animation is Studio PuYUKAI. Asini Minoru is the director/screenwriter; Takahara Minoru is the character designer and general director. The latest news and information are posted on the series official site. The opening theme for this series is Isekai Quartet and the ending theme is Isekai Girls Talk.
So far, two seasons have been released, with a third on the way.
A Season 3, following the last title with Isekai Quartet 3, has been confirmed to be in production March 31, 2021. The season is introducing new characters from another series: Cautious Hero. It is speculated that the transfer students are only temporary, and last season's transfer students may not return.
Summary[]
A mysterious switch appeared one day. When pressing it, they were sent to a different world! In a desire to return to their home, Tanya and her comrades must go through High School classes. Tanya and her comrades figure out they aren't alone in the situation, as three other worlds were affected by this switch too. In the end, the four vastly different groups unite in order to return back to their old lives.
Season 1[]
| Images | Episode Title | Air Date | Episode |
|---|---|---|---|
 |
Come Together! Quartet 集結！かるてっと Shūketsu! Karutetto |
April 9, 2019 | 1 |
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Tension! Introductions 緊迫！じこしょうかい Kinpaku! Jiko Shōkai |
April 16, 2019 | 2 |
 |
Deadlock! Classmates 膠着！くらすめいと Kōchaku! Kurasumeito |
April 23, 2019 | 3 |
 |
Encounter! Classmates 邂逅！くらすめいと Kaigō! Kurasumeito |
April 30, 2019 | 4 |
 |
Explosion! Talent Show 炸裂！こんしんかい Sakuretsu! Kon Shinkai |
May 7, 2019 | 5 |
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Decision! Class Rep 決定！いいんかい Kettei! Īinkai |
May 14, 2019 | 6 |
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Carry Out! Class Rep 遂行！いいんかい Suikō! Īnkai |
May 21, 2019 | 7 |
 |
Prepare! Field Trip 準備！りんかいがっこう Junbi! Rinkai gakkō |
May 28, 2019 | 8 |
 |
Enjoy! Field Trip 満喫！りんかいがっこう Mankitsu! Rinkai gakkō |
June 4, 2019 | 9 |
 |
Join In! Rivals 参戦！らいばるたち Sansen! Raibaru-tachi |
June 11, 2019 | 10 |
 |
Work Together! Field Day 協力！たいいくさい Kyōryoku! Taīkusai |
June 18, 2019 | 11 |
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Band Together! Quartet 団結！かるてっと Danketsu! Karutetto |
June 25, 2019 | 12 |
Season 2[]
| Images | Episode Title | Air Date | Episode |
|---|---|---|---|
| Join the Fight! Transfer Student 参戦！てんこうせい Sansen! Ten Kōsei |
January 14, 2020 | 13 | |
| Sneak in! The Principal's Office 潜入！こうちょうしつ Sennyū! Kō chōshitsu |
January 21, 2020 | 14 | |
| Uh-Oh! Detention 反省！しどうしつ Hansei! Shi-dōshitsu |
January 28, 2020 | 15 | |
| Pinch! Test of Learning 窮地！ がくりょくてすと Kyūchi! Gakuryoku tesuto |
February 4, 2020 | 16 | |
| Work Hard! Valentine's Day 勤勉！ばれんたいんでー Kinben! Barentaindē |
February 11, 2020 | 17 | |
| Clash! Dodgeball 激突！どっじぼーる Gekitotsu! Dojjiboru |
February 18, 2020 | 18 | |
| Excitement! Physicals Day 興奮！しんたいそくてい Kōfun! Shintaisoku tei |
February 25, 2020 | 19 | |
| Challenge! Part-Time Job 挑戦！あるばいと Chōsen! Arubaito |
March 3, 2020 | 20 | |
| Investigate! First Errand 調査！はじめてのおつかい Chōsa! Hajimete no Otsukai |
March 10, 2020 | 21 | |
| Rise Up! School Festival 決起！がくえんさい Kekki! Gakuensai |
March 17, 2020 | 22 | |
| It Begins! School Festival 開幕！がくえんさい Kaimaku! Gakuensai |
March 24, 2020 | 23 | |
| The Show Begins! Showtime 開演！しょーたいむ Kaien! Shōtaimu |
March 31, 2020 | 24 |
Trivia[]
- The name of the show refers to 4 productions of the Isekai genre. This show is also an Isekai, as citizens of all four shows are put into a new, unfamiliar world.
- When it comes to affected characters, the official number isn't fully known.
- Staff who created Youjo Shenki (ようじょしぇんき), Re: PETIT ~Starting Life in Another World from PETIT~ (Re:プチから始める異世界生活), and Pure Pure Pleiades (ぷれぷれぷれあです) also worked together on this joint animation series.