Isekai Quartet 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.

KonoSuba: God's Blessing on This Wonderful World!, often referred to simply as KonoSuba, is a Japanese light novel series written by Natsume Akatsuki and illustrated by Kurone Mishima. The series follows Kazuma Satou, a boy who is sent to a fantasy world with MMORPG elements following his death, where he forms a dysfunctional adventuring party with a goddess, an archmage, and a crusader. Originally serialized as a web novel on Shōsetsuka ni Narō between December 2012 and October 2013, KonoSuba was published as a printed light novel series by Kadokawa Shoten under the company's Kadokawa Sneaker Bunko imprint from October 2013 to May 2020. The light novel series features a divergent plot.