New Anime Isekai Quartet Season 3 Premieres in October with New PV and Theme Songs Featuring the Main Protagonists
The crossover anime Isekai Quartet, which unites characters from the popular isekai light novels Overlord, KonoSuba: God’s Blessing on This Wonderful World!, Re:Zero -Starting Life in Another World-, and The Saga of Tanya the Evil, will begin airing and streaming in October on TOKYO MX, d Anime Store, and other platforms. The announcement was made on September 18 along with the release of the Season 3 key visual and main promotional video.

Isekai Quartet Season 3 Set for October (C) Isekai Quartet 3 / KADOKAWA
The new key visual depicts all 58 characters performing music together. In the newly released PV, fresh daily adventures unfold with the addition of characters from The Eminence in Shadow.

Isekai Quartet Season 3 Set for October (C) Isekai Quartet 3 / KADOKAWA
The opening theme revealed in the PV will be performed by Ainz (voiced by Satoshi Hino) from Overlord, Kazuma (voiced by Jun Fukushima) from KonoSuba: God’s Blessing on This Wonderful World!, Subaru (voiced by Yusuke Kobayashi) from Re:Zero -Starting Life in Another World-, and Tanya (voiced by Aoi Yūki) from The Saga of Tanya the Evil.
The ending theme, continuing from the theatrical edition, will once again be performed by Konomi Suzuki and Kashitaro Itō. Both songs are scheduled for digital release on October 14.

Isekai Quartet Season 3 OP

Isekai Quartet Season 3 ED
Source : Hotel Inhumans official