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The Relative Worlds
ソウタイセカイ; (Sōtai Sekai)
Original net animation
Directed by	Yūhei Sakuragi
Written by	Yūhei Sakuragi
Music by	Hidehiro Kawai
Studio	Craftar
Released	April 28, 2017; May 5, 2017
Anime film
Directed by	Yūhei Sakuragi; Hiroki Matsūra; Tomoyuki Takae;
Produced by	Tomohiko Ishii
Written by	Yūhei Sakuragi
Music by	Hidehiro Kawai
Studio	Craftar
Released	January 25, 2019
Runtime	93 minutes

The Relative Worlds (Japanese: ソウタイセカイ, Hepburn: Sōtai Sekai) is a Japanese CG original net animation (ONA) series planned and produced by Craftar.^[1] The anime is divided into two parts: the first part was released on Hulu Japan on April 28, 2017, with the second part releasing on May 5, 2017.^[2]

In October 2018, Craftar revealed that a film adaptation titled Even if the World Will End Tomorrow (Japanese: あした世界が終わるとしても, Hepburn: Ashita Sekai ga Owaru Toshitemo) would be released. The film premiered on January 25, 2019.^[3] The film follows a slightly altered plot, with the staff and most of the main cast of the ONA returning to reprise their roles.

Plot

Sōtai Sekai

The story is set in Japan year 2020. Focuses on Shin Hazama, a third-year high school student who just lost his father. He encounters a version of himself who has spent a different life in another Japan, Jin. That's when he knew that the everyday life he has starts to crack, and battle between another world and another self begins.

Ashita Sekai

The film centers on Shin and Kotori, who are both third years in high school. Shin lost his mother when he was little, and since then he has a tendency to close himself off. Kotori is his childhood friend who always looks out for him. One day, another "self" from another Japan appears in front of them.

Cast

Shin Hazama (狭間真, Hazama Shin): Voiced by: Yūki Kaji (ONA, movie)^[4]; Shin is a high school student who recently lost his father and moves in with his uncle Tetsuya. One day, he meets Jin, his other self from a parallel universe who wants to kill Kotori, as it'll end the suppressive reign of Kotori's other self in the parallel world, Princess Kotoko.
Jin Hazama (ハザマジン): Voiced by: Yūki Kaji (ONA), Yoshiki Nakajima (movie)^[4]; Jin comes from an oppressive version of Japan where it is under the ironclad rule of Princess Kotoko. After the death of his father, he sets out to a parallel universe to kill Kotoko's other self while facing obstacles in his way.
Kotori Izumi (泉琴莉, Izumi Kotori): Voiced by: Maaya Uchida (ONA, movie)^[4]; Kotori is Shin's childhood friend who has always tried to be there for him despite his reluctance. She is the target of the parallel world attacks as her other-self is an oppressive ruler.
Kotoko Izumi (イズミコトコ): Voiced by: Maaya Uchida (ONA), Sayaka Senbongi (movie)^[4]; Princess Kotoko is an ironclad oppressive ruler who controls Japan.
Miko (ミコ): Voiced by: Aoi Yuki (ONA, movie)^[4]; Miko is a fixer who comes into contact and makes a contract with Kotori.
Niko (ニコ): Voiced by: Aoi Yuki (ONA)
Riko (リコ): Voiced by: Inori Minase (movie)^[4]; Miko's "younger sister" and Kotoko's fixer.
Genji Hazama: Voiced by: Kenjiro Tsuda (movie)^[5]; Genji is Shin's father. He is a scientist who suddenly dies from an unnatural cause.
Shū Izumi: Voiced by: Toshiyuki Morikawa (movie)^[5]; Shu is Kotori's father. Shin's father works for him.
Yūri: Voiced by: Nana Mizuki (movie)^[5]; Yuri is a scientist and the head of a mysterious research project that she is cooperating with Princess Kotoko on, behind the scenes.

Production

Hakuhodo's animation studio, Craftar, planned and produced the series, while Yūhei Sakuragi directed and wrote the screenplay. Hidehiro Kawai composed the music. PALOW. did the character design while Rui Tomono did the concept art. Craftar and Lucky Pictures collaborated on CGI production,^[1] where they used the Unity game engine for rendering as well as crowd shots.^[6] Three-member unit Reol performed both the opening and ending theme, titled "VIP KID" and "ChiruChiru" (ちるちる), respectively.^[7]