"That Time I Got Reincarnated as a Slime": Fourth Season Reveals Visual Concept and Musical Accompaniment

The production team of the anime television series "That Time I Got Reincarnated as a Slime" has presented initial details for the fourth season. A newly released key visual and a promotional video offer insights into the continuation of the story about the slime Rimuru.

The central key visual for the first half of the season features the characters Rimuru, Mariabell, and Yuuki. The design hints at the escalating conflicts between various factions that were already established in the third season. Observers see this as an indication of a possible direct confrontation with a rivalry that has existed since the early episodes of the series.

The first promotional video for the new season is also available. It provides initial glimpses into the plot and the animation production.

Two musical acts have been secured for the theme songs of the fourth season. The opening of the episodes will be accompanied by the song "絵空事" (Esoragoto) by singer Eir Aoi. She described her contribution in a statement as a "powerful rock number that aligns with the epic scale of the narrative." She expressed surprise and delight at being involved in a production cherished worldwide.

The group CiON will provide the ending theme with the song "渇望" (Katsubō). The musicians described their piece as a "sonically powerful composition with a sense of deeply felt longing." The work on the song was inspired by the character of Rimuru, who gains companions through strength and kindness. They hope the song will resonate with the emotions of the viewers.

The fourth season of "That Time I Got Reincarnated as a Slime" is scheduled to begin in Spring 2026. The production will once again be handled by Studio 8bit. The series is based on the novel series of the same name by Fuse with illustrations by Mitz Vah, which also exists as a manga adaptation by Taiki Kawakami. The story follows an average office worker who, after his violent death, is reincarnated as a slime in a fantasy world and strives to build a realm where humans and monsters can coexist peacefully.

The success of the franchise is reflected in a total circulation of over 56 million copies of the print media. Following the first adaptation in 2018, two more seasons and films were produced. Currently, the second film in the series, titled "劇場版 転生したらスライムだった件 蒼海の涙編" (The Movie: That Time I Got Reincarnated as a Slime: Tears of the Azure Sea), is running in Japanese theaters. A trade magazine recently published a report on a visit to the producing Studio 8bit, which offered insights into the working methods and effort behind the animated visuals.

The production team for the fourth season consists of familiar names: The director is Tsuda Naokazu, supported by Yasuda Kenji as co-director. The series composition is by Ogawa Hitomi, and the character design is by Ebata Ryōma. The art direction is handled by Sato Ayumi, and the music is composed by R･O･N.

The voice cast includes, among others, Okazaki Miho as Rimuru, Toyoguchi Megumi as the Voice of Wisdom, Maeno Tomoaki as Veldora, and Furukawa Makoto as Benimaru. Other roles are voiced by Chikusa Kibumaki, M･A･O, Eguchi Takuya, Ohotsuka Hōchū, and many other well-known voices.