Movie
Description
Sōta Munakata is a young Closer, tasked with journeying across Japan to locate and seal supernatural doors that release the destructive "worm," causing earthquakes if left open. These doors are portals to the Ever-After, the realm of souls, and Closers like Sōta, trained by his grandfather Hitsujirō Munakata, prevent disasters by locking them. Primarily raised by his grandfather with no mention of parents, Sōta also pursues higher education aiming to become a teacher, balancing conventional aspirations with his ancestral duty. He maintains a friendship with Tomoya Serizawa, referencing a debt of 20,000 yen.

Investigating a door at an abandoned resort, Sōta encounters Suzume Iwato just as she inadvertently releases the keystone guardian Daijin, a cat-like entity vital for sealing doors. Explaining the gravity of the situation to Suzume, Sōta is later cursed by Daijin at her home. The curse transforms him into Suzume's small, yellow, three-legged childhood chair—a symbol of her trauma and loss, originally belonging to her deceased mother and missing one leg.

Trapped in this chair form yet retaining consciousness and mobility, Sōta relies on Suzume's help. Together, they pursue Daijin across Japan to close newly opened doors and prevent disasters. Initially resistant to Suzume's involvement, Sōta demonstrates a calm, duty-bound, and analytical personality, gradually accepting their partnership as effective.

In Tokyo, a critical revelation occurs: Daijin discloses that Sōta's transformation also transferred the role of the eastern keystone to him, meaning he is gradually losing his humanity to become a permanent seal for the worm. Accepting this fate, Sōta instructs Suzume to use him as the keystone to prevent a catastrophic earthquake, resulting in his entrapment within the Ever-After.

Suzume later rescues Sōta by entering the Ever-After with the aid of both keystones, Daijin and Sadaijin. During this rescue, Sōta witnesses Suzume's pivotal interaction with her younger self. Freed, he returns to human form, reunites with Tomoya, and later encounters Suzume again near her hometown, indicating a continued connection.

Assessments describe Sōta as conscientious, reserved, principled, and possessing a strong sense of responsibility. He exhibits analytical problem-solving and a focus on duty, alongside warmth and protectiveness, especially towards children. Pressure from his grandfather to uphold family traditions contributes to his initial reluctance to seek help.

Etymologically, his given name "Sōta" combines "grass/herb" (草) and "thick/great" (太), while his surname "Munakata" derives from the Shinto myth of the Three Munakata Goddesses, sea deities born from a shattered sword, underscoring his role as a guardian against natural disasters.