The Secret Behind Diablo's Unwavering Obsession with Rimuru Revealed

Saurav Kumar Jul 05, 2026 0

Unraveling the Mystery: Why is Diablo So Obsessed with Rimuru?

Fans of That Time I Got Reincarnated as a Slime, affectionately known as #Tensura, often marvel at the unwavering loyalty and intense fascination the powerful Primordial Demon Diablo holds for our beloved slime protagonist, Rimuru Tempest. It's not just devotion; it's an outright obsession that transcends typical master-servant relationships. But what exactly ignited this profound fixation? The answer lies in a series of events involving a desperate plea, an unexpected human, and a mask that defied the very laws of the world—until Rimuru appeared.

The Genesis of Fascination: Shizu and the Unbreakable Mask

The story of Diablo's obsession doesn't begin with Rimuru, but with a pivotal encounter far earlier in his existence. Did you know why Diablo is so obsessed with Rimuru? It dates back to a time when Diablo was first summoned by a desperate woman. Her plea? To take revenge on the demons who were controlling the kingdom of Filtwood behind the scenes. As Diablo prepared to carry out his devastating massacre, he encountered a human named Shizu Izawa, who bravely tried to stop him.

Diablo, a being who had spent millions of years mastering magic, decided to eliminate Shizu before continuing his main task. However, something completely unexpected happened: Shizu's mask repelled Diablo's attack. For a primordial demon of his caliber, this was impossible. Shizu was just a human, yet the mask protected her in a way that Diablo couldn't understand. He concluded that the mask was defying the very laws of the world, a truly unprecedented phenomenon.

"If the mask were a world rule-breaking object, yet it cracked simply by being near Rimuru, then Rimuru himself had to be something even more broken." - Diablo's shocking conclusion.

From that moment on, Diablo became deeply interested in this nature. This inexplicable defiance of fundamental laws captivated him. He started quietly observing Shizu from a distance, monitoring her life for years and trying to understand the secret behind the mask. But no matter how much he watched, the true nature of the mask remained beyond his understanding, a persistent enigma that fueled his intellectual curiosity.

Rimuru's Arrival: The Catalyst for True Obsession

The long vigil ended dramatically when Shizu met Rimuru Tempest. In Rimuru's presence, the mysterious mask began to crack. This crack wasn't just a physical degradation; it was the key to unlocking the truth Diablo had sought for centuries. The cracking of the mask led to the fire spirit Ifrit inside her being freed and taking control of Shizu's body.

That single change was enough for Diablo to reach a shocking conclusion. If the mask, an object he deemed 'world rule-breaking' due to its impenetrable defense against his power, could crack simply by being near Rimuru, then Rimuru himself had to be something even more 'broken'—a being whose very existence challenged and reshaped the fundamental principles of their reality. This profound realization shifted Diablo's focus entirely from the mask to Rimuru. The slime was not just powerful; he was an anomaly, a living paradox that redefined the impossible.

A Primordial's Devotion to the Unexplainable

For a primordial demon like Diablo, who had mastered every aspect of magic and understood the world's mechanics to an unparalleled degree, encountering something that defied his comprehension was the ultimate intellectual stimulus. Rimuru wasn't just a new challenge; he was a living mystery, an embodiment of the extraordinary that surpassed even the "world rule-breaking" mask. This is the core of Diablo's obsession: a desire to understand, to serve, and to witness the unfolding potential of a being who stands outside the established order.

His loyalty, therefore, isn't just born of power dynamics but from a deep, intellectual fascination with Rimuru's unique existence. He sees in Rimuru not just a master, but a phenomenon, a being whose presence promises to unravel the deepest secrets of the universe. This makes their bond one of the most compelling relationships in the #Tensura universe.

// FAQs

Diablo's obsession with Rimuru stems from his realization that Rimuru is a being even more 'broken' and capable of defying world laws than Shizu's mysterious mask, which had previously captivated Diablo for centuries.

Shizu's mask, which inexplicably repelled Diablo's powerful attack, sparked his initial curiosity. He then observed her for years, trying to understand how a mere human's mask could defy his magic.

When Diablo attempted to eliminate Shizu, her mask inexplicably repelled his attack. For a primordial demon who had spent millions of years mastering magic, this was impossible, leading him to conclude the mask defied the very laws of the world.

Diablo was first summoned by a desperate woman to take revenge on the demons who were controlling the kingdom of Filtwood behind the scenes, a task he was about to carry out before Shizu intervened.

Diablo concluded that if the 'world rule-breaking' mask cracked simply by being near Rimuru, then Rimuru himself had to be something even more fundamentally 'broken' and capable of defying the world's established order, thus shifting his obsession to Rimuru.