The King of Fighters All Star (KOFAS) is a beat 'em up action role-playing game developed by Netmarble Neo and published by Netmarble. It was first released in Japan on July 26, 2018, for the iOS and Android. The game is a retelling of SNK's The King of Fighters games with the player being able to create their own team as they battle across multiple annual tournaments. It was released in English regions on October 22, 2019. A Microsoft Windows version is also available, starting from its beta version on February 10, 2022.

Gintama is a Japanese manga series written and illustrated by Hideaki Sorachi. It was serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump from December 2003 to September 2018, later in Jump Giga from December 2018 to February 2019, and finished on the Gintama app, where it ran from May to June 2019. Its chapters were collected in 77 tankōbon volumes. Set in Edo, which has been conquered by aliens named Amanto, the plot follows samurai Gintoki Sakata, who works as a freelancer in his self-established store, "Yorozuya", alongside his friends Shinpachi Shimura and Kagura, offering a wide range of services to handle various tasks and odd jobs. Sorachi added the science fiction setting to develop characters to his liking after his editor suggested doing a historical series.