That Time I Got Reincarnated as a Slime the Movie: Scarlet Bond 2023

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As the dust settles on their tumultuous departure from Clayman’s army, an Ogre and his band of mercenaries are brutally ambushed by Clayman’s soldiers, led by the merciless Yamza. The Ogre, left severely wounded, is rescued by the benevolent citizens of the Kingdom of Raja, where he is rechristened “Hiiro” by its compassionate queen Towa, as she nurses him back to health. Ten days later, Hiiro makes a daring escape from Raja’s borders and returns to the ruins of his Ogre Village, only to discover that it has been decimated by the brutal Orcs. Consumed by a burning desire for vengeance against these marauders, Hiiro returns to Raja four days later and pledges his allegiance to Towa.

Meanwhile, Rimuru - fresh from vanquishing Clayman and now recognized as one of the esteemed Demon Lords - is informed by Souei of an impending attack on Geld and his fellow Orcs. As Hiiro and his two Raja subordinates clash with the Orcs, Geld learns that Hiiro seeks revenge against his entire race, prompting him to abandon his weapons and accept his fate at Hiiro’s hands. However, Benimaru intervenes, saving Geld and calming Hiiro, who reveals that he is actually Benimaru’s childhood friend. Reunited with Benimaru, Shion, Shuna, Hakuro, Souei, and Kurobe, Hiiro reconciles with Geld after learning that the Orcs are no longer his enemies.

During a grand feast hosted by Rimuru, Hiiro shares a crucial revelation: he has arrived at the Jura Tempest Federation as Raja’s messenger to request permission to cultivate a portion of the majestic Great Jura Forest as a food source for his kingdom. Furthermore, he informs that Queen Towa is suffering from the debilitating effects of Curse Poison, brought on by her use of the tiara’s power to purify a toxic lake filled with pollutants from Raja’s gold mines. Moved by Hiiro’s words, Rimuru decides to pay a visit to the beleaguered kingdom and lend his aid in this time of need.

As Rimuru, Benimaru, Shion, Shuna, and Ranga arrive at Raja, they find themselves face to face with a dire situation. Towa, the kingdom’s princess, lies gravely ill, her health ravaged by the toxic waters of the lake. Rimuru springs into action, diagnosing the problem and treating Towa with honey from Tempest, gradually restoring her vitality. As they work to uncover the source of the poisoning, Rimuru reveals a hidden structure beneath the lake’s surface, an ancient magic circle responsible for the toxins’ release. This discovery enrages Lacua, the cunning merchant behind the scheme, who seeks to create another catastrophe to curry favor with the malevolent Primordial demon Violet.

Meanwhile, Lacua manipulates Hiiro into ingesting a Curse Orb, deceiving him with promises of transferring Towa’s soul into his healthy body. As Rimuru gives chase to Lacua, Benimaru engages Hiiro in combat, while Shuna stands guard over the ailing Towa. Meanwhile, Diablo ventures forth to confront Violet, uncovering a tangled web of deceit and ancient pacts. The demon reveals that she had gifted the tiara and magic circle to Raja’s previous queen as part of a twisted game, where if the possessor succumbs to the Curse Poison, Violet can claim physical rebirth by taking over their body.

As tensions escalate, Rimuru and his allies mobilize against the looming threat, even as Diablo negotiates with Violet, securing an agreement that leaves Raja alone while severing ties between the demon and Towa’s lineage. The stage is set for a climactic showdown, as Rimuru confronts Lacua in a final, brutal encounter. Despite Lacua’s desperate attempt to destroy everything around him through self-immolation, Rimuru contains the explosion, foiling his plans.

In the aftermath, Hiiro extracts the Curse Orb from his body and destroys it, rendering it harmless. The kingdom’s doctor, revealed to be an accomplice of Lacua, meets a fitting demise at the hands of Ranga, as justice is served and order restored to Raja.

As Towa unleashes the unfettered might of the tiara, she sacrifices her very essence to revive Hiiro from his curse-entombed slumber. Her body becomes a canvas for the Curse Poison’s dark energies, ultimately disappearing into the void as a result. However, in a stunning turn of events, Violet intervenes, using her extraordinary abilities to restore Towa to life as a gesture of atonement for the misguided actions of her loyal subordinate. Amidst this tumultuous backdrop, Rimuru seizes the opportunity to forge an alliance with Tempest’s ruling council, offering his kingdom’s expertise in reconstruction efforts in exchange for access to their abundant iron ore reserves. As Rimuru returns to Tempest, he is met with a surreal scene: the once-thriving city lies partially ravaged, its destruction a direct result of the unbridled playfulness of Veldora and Milim. With a heavy heart, Rimuru takes it upon himself to mete out justice to the two troublemakers before succumbing to his own exhaustion, his strength finally beginning to wane.