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

The story begins with an ambush by Clayman's soldiers led by the ruthless Yamza. During this chaotic encounter, the Ogre and his group of mercenaries are severely injured and forced to flee.

The injured Ogre is taken in by the compassionate inhabitants of the Kingdom of Raja. Here, Queen Towa gives him the name 'Hiiro' as she tends to his wounds, showing the kindness of her people.

After ten days of recovery, Hiiro makes a daring escape from Raja's care. His journey leads him back to the ruins of the Ogre Village, where he discovers it has been devastated by Orcs.

Driven by vengeance against the Orcs for ruining his home, Hiiro returns to Raja four days later. He then pledges his loyalty to Queen Towa, ready to fight for her and his people.

Meanwhile, Rimuru has just defeated Clayman and ascended to the esteemed position of a Demon Lord. He learns from Souei about an imminent threat targeting the Orcs, adding urgency to his responsibilities.

As Hiiro confronts the Orcs alongside his allies from Raja, tensions rise when Geld realizes that Hiiro seeks vengeance against his race. This leads to a confrontation full of emotional turmoil.

In a moment of desperation, Benimaru intervenes to save Geld, calming Hiiro's rage. During this emotional reunion, Hiiro reveals their shared past as childhood friends, which shifts the dynamics of their conflict.

During a grand feast, Hiiro presents an important mission as Raja's envoy. He requests permission from Rimuru to farm part of the Great Jura Forest to provide food for his kingdom while revealing a dire plague affecting Queen Towa.

Upon reaching Raja with his companions, Rimuru is faced with a crisis. Queen Towa is seriously ill due to poisoning from a toxic lake, prompting an urgent need for immediate medical intervention.

In a swift response, Rimuru diagnoses Towa's condition and begins treating her with honey from Tempest. This treatment results in a gradual recovery for Towa, showcasing Rimuru's prowess.

While investigating the poisoning, Rimuru uncovers an ancient magical structure beneath the lake which harbors a toxic spell. This discovery reveals the underlying conspiracy led by Lacua, a malicious merchant.

Lacua cunningly tricks Hiiro into consuming a Curse Orb, deceiving him into believing it would help save Towa. This act leads to intense battles as Rimuru and Benimaru attempt to rescue their friend from the manipulations.

Tensions escalate as Rimuru engages Lacua in a final, fierce battle. Meanwhile, Diablo confronts Violet, unraveling a web of betrayal as the demonic influences interweave with the fate of Raja.

In a heartbreaking moment, Towa sacrifices herself to resurrect Hiiro, offering her essence to restore balance. Her transformation into a vessel for the Curse Poison adds depth to the tragedy unfolding.

In a surprising turn, Violet resurrects Towa, seeking redemption for past betrayals. Meanwhile, Rimuru forges a partnership with the ruling council of Tempest, promising resources for reconstruction in exchange for collaboration.