This list of books are ONLY the books that have been ranked on the lists that are aggregated on this site. This is not a comprehensive list of all books by this author.

1. 1. 転生したらスライムだった件 1 [Tensei Shitara Slime Datta Ken [Light Novel] 1]

   

   After dying in modern Japan, a salaryman is reborn in a fantasy world as a slime endowed with powerful skills like Predator and Great Sage. Befriending a sealed storm dragon and taking the name Rimuru, he unites local monsters by protecting a goblin tribe, subduing direwolves, and forging ties in a dwarven city. His rising influence leads to a confrontation with a masked heroine possessed by a fire spirit, and her tragic story inspires him to gain a human form and a larger purpose. By the end, he lays the groundwork for a peaceful monster community while seeking answers about summoners and the dragon’s imprisonment.

2. 2. That Time I Got Reincarnated As A Slime , Vol. 12

   

   The Eastern Empire launches a full-scale invasion of Tempest, but meticulous preparations and the overwhelming prowess of Rimuru’s top commanders shatter the vanguard and expose deeper conspiracies driving the war. As the Empire unveils its true power—an aloof emperor backed by a blazing True Dragon—the conflict escalates into a high-stakes clash of strategy, politics, and Ultimate Skills. With an invaluable ally seized as a living weapon and enemies striking from the shadows, Rimuru must protect his nation, outmaneuver masterminds, and let Diablo and the other executives off the leash to turn the tide.

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3. 3. 転生したらスライムだった件 19 [Tensei Shitara Slime Datta Ken 19]

   

   With peace newly forged with the Holy Empire, the nation throws open its gates for a grand founding festival that doubles as a diplomatic summit and economic showcase. A spectacular tournament and the debut of a sprawling dungeon draw crowds and bolster Tempest’s reputation, while the ever-lucky-to-survive Masayuki stumbles into stardom as a “hero” to the masses. Amid the festivities, trusted lieutenants handle security and commerce as visiting rulers and saints test the waters of cooperation. Behind the scenes, the city’s leader leverages the momentum to solidify alliances, measure the strength of key subordinates, and quietly prepare for looming threats.

4. 4. 転生したらスライムだった件 18 [Tensei Shitara Slime Datta Ken 18]

   

   As the Empire’s invasion of Tempest reaches its climax, Velgrynd seizes Veldora to empower Emperor Rudra’s offensive, driving battles across Ramiris’s labyrinth and the wider continent. Rimuru’s forces, led by his primordial demons, blunt the imperial advance while political maneuvers expose the true mastermind, culminating in Guy Crimson’s clash with Rudra and the awakening of the angelic will Michael. A daring rescue and deft diplomacy bring the war to a close, reshaping imperial leadership and forging a tenuous peace even as a greater, godlike threat begins to stir.
5. 5. 転生したらスライムだった件 17 [Tensei Shitara Slime Datta Ken 17]

   

   After the defeat of the invading forces, the burgeoning nation braces for the Empire’s counterstrike as the Emperor himself advances with the backing of terrifying allies. World-shaking battles erupt among True Dragons and Demon Lords, long-hidden bonds and ancient pacts come to light, and a powerful will seeks a vessel to reshape the world. With a cherished ally captured and the stakes escalating, the protagonists maneuver alliances and strategies to thwart an impending apotheosis and set the stage for the climactic showdown.

6. 6. 転生したらスライムだった件 16 [Tensei Shitara Slime Datta Ken 16]

   

   War with the Eastern Empire erupts in full, and Rimuru orchestrates Tempest’s defense using the labyrinth as a strategic trap while his generals and the primordial demons crush incursions on land and sea. As Masayuki’s unexpected rise as a hero fractures imperial morale, covert plots involving the Empire’s elites and shadowy backers surface, revealing a larger game behind the invasion. The campaign drives toward a looming confrontation with the Empire’s leadership, setting the stage for an even greater conflict to come.

7. 7. 転生したらスライムだった件 15 [Tensei Shitara Slime Datta Ken 15]

   

   A militaristic empire launches a massive invasion, forcing the burgeoning monster nation to execute a meticulously planned defense that leverages its labyrinth fortress and overwhelming elites to upend the enemy’s numbers. As decisive battles erupt across multiple fronts, hidden agendas and political gambits behind the conflict come to light, revealing a far more dangerous mastermind and setting the stage for an even larger showdown that will challenge fragile alliances and the nation’s enigmatic leader.

8. 8. 転生したらスライムだった件 14 [Tensei Shitara Slime Datta Ken [Light Novel] 14]

   

   Tempest’s grand festival and newly unveiled labyrinth draw nations, adventurers, and dignitaries from across the world, serving as both a showcase of power and a diplomatic stage. Alliances are cemented with former foes, a reluctant “hero” stumbles into fame, and neighboring realms undergo leadership changes that shift regional politics. While conspirators manipulate events from the shadows and test Tempest’s defenses, preparations quietly begin for a looming confrontation with a vast eastern empire. The story blends spectacle, statecraft, and foreshadowing as the burgeoning nation consolidates strength for the conflicts ahead.

9. 9. That Time I Got Reincarnated As A Slime , Vol. 13

   

   An expansionist eastern empire finally makes its move against the Jura Tempest Federation, forcing its leader to tighten alliances, fortify defenses, and evacuate civilians into the nation’s labyrinth while trusted commanders take charge on the front lines. Elite enemy units and shadowy schemers launch probing strikes and infiltration attempts, sparking brutal skirmishes and political gambits across multiple theaters. As tensions escalate, powerful figures on both sides reveal new abilities and hidden agendas, and the opening phase of a massive war begins—one that will challenge Tempest’s ideals of coexistence as much as its military might.

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10. 10. That Time I Got Reincarnated As A Slime , Vol. 11

    

    An assassination scheme throws the Holy Empire of Lubelius into turmoil and pins the blame on the monster nation, threatening to ignite war. Determined to avert catastrophe, Rimuru heads into enemy territory to parley with Hinata and untangle a web of church intrigue and hidden manipulators. With the surprising intervention of the faith’s true patron, the conspiracy is laid bare, hostilities are stayed, and a cautious new alliance begins to take shape as Tempest’s broader nation-building plans continue.

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11. 11. That Time I Got Reincarnated As A Slime Light Novels, Vol. 10

    

    Now recognized as a Demon Lord, Rimuru pivots from warfare to nation‑building by unveiling Tempest’s grand Founders Festival to boost diplomacy, commerce, and prestige. As a high-profile tournament draws adventurers and dignitaries, Ramiris’s dungeon project takes shape to anchor a new entertainment economy, while Diablo and other confidants quietly manage political risks behind the scenes. Amid comic mishaps and surprise upsets, the festivities become a stage to forge alliances, showcase Tempest’s strength, and solidify its place on the world stage.

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12. 12. That Time I Got Reincarnated As A Slime , Vol. 9

    

    In the wake of recent upheavals, a newly risen demon lord seeks to secure his nation’s future by mending relations with the Western Holy Church, leading to a tense clash with its uncompromising paladin commander. As shadowy conspirators within the church orchestrate an assassination and frame his allies, both sides are driven to the brink of war. Political maneuvers and sudden battles force hidden powers to reveal themselves, unraveling the plot and exposing long-guarded truths. With misunderstandings resolved and the real culprits unmasked, a fragile peace is forged that opens the door to deeper diplomacy and cooperation.

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13. 13. That Time I Got Reincarnated As A Slime , Vol. 8

    

    As the newly established monster nation opens its doors with a lavish founding festival and high-profile battle tournament, visitors from across the world pour in—among them a mysteriously “lucky” hero whose sudden fame ignites rumors and rivalries. While the revelry captivates the public, behind the scenes the nation’s leader hosts a diplomatic summit to secure recognition and reparations, trusted agents move to overhaul a hostile human kingdom, and delicate negotiations with a powerful church expose hidden schemers—setting the stage for a new balance of power in the West.

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14. 14. That Time I Got Reincarnated As A Slime , Vol. 7

    

    Having evolved into a Demon Lord and revived his fallen comrades, Rimuru moves to settle accounts with the manipulative Clayman. Invited to the Demon Lords’ council, Walpurgis, he arrives with newfound power and allies, exposing the schemes behind the assault on his nation. A fierce confrontation erupts—Milim’s apparent turn, Veldora’s timely entrance, and Shion’s long-awaited payback—ending in Clayman’s utter defeat. In the aftermath, the Demon Lords reorganize as the Octagram, with Rimuru taking his place among them and shifting the world’s balance of power.

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15. 15. That Time I Got Reincarnated As A Slime , Vol. 2

    

    With his fledgling village taking root in the Jura Forest, Rimuru works to unite goblins, direwolves, and new allies when a ravenous orc horde—manipulated by a scheming majin—threatens to devour everything. After a tense clash with proud ogres and uneasy dealings with lizardmen, he forges a coalition and empowers his companions for the coming war. The campaign culminates in a fierce battle against the Orc Lord-turned-Disaster and the unmasking of the mastermind behind the invasion, shifting the forest’s balance of power. In the aftermath, Rimuru sets the stage for a nation where diverse races can coexist under his protection.

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16. 16. That Time I Got Reincarnated As A Slime , Vol. 6

    

    In the wake of his ascension, Rimuru consolidates Tempest’s stability and attends the Demon Lords’ convocation to challenge the schemer behind recent attacks. A high-stakes confrontation with Clayman erupts, drawing in formidable allies and foes, exposing hints of a deeper conspiracy, and testing new powers and alliances. The outcome reshapes the political order into the Octagram and firmly establishes Tempest’s legitimacy, setting the stage for larger conflicts to come.

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17. 17. That Time I Got Reincarnated As A Slime , Vol. 5

    

    While expanding his fledgling nation, Rimuru travels to the capital to honor a promise to guide Shizu’s students, then ventures to the Dwelling of Spirits with Ramiris to secure powerful spirits that can stabilize the children’s lives. Meanwhile, tensions rise across the West as the Kingdom of Falmuth and the Western Holy Church scheme against his growing influence, and on the road home he’s ambushed by the Church’s knight-captain Hinata Sakaguchi—an encounter that leaves ominous signs of greater conflict to come.

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18. 18. That Time I Got Reincarnated As A Slime Light Novels, Vol. 4

    

    With the orc war resolved, a certain slime turns to nation-building in the Jura Forest, forging trade routes and delicate diplomatic ties with neighboring realms. The sudden arrival of an unpredictable demon lord—who takes a mischievous liking to the nascent country—draws even more attention, just as a calamity-class threat is set loose by hidden manipulators. To protect his burgeoning federation, he rallies new allies, balances power politics with wary kings and merchants, and confronts the airborne menace, laying the groundwork for formal recognition and bigger conflicts to come.

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19. 19. That Time I Got Reincarnated As A Slime , Vol. 3

    

    After defeating the Orc Disaster, Rimuru unites the monsters of the Jura Forest into a fledgling nation, forging trade ties and laws while building a peaceful society. The whimsical Demon Lord Milim crashes into their midst and declares friendship, unsettling the balance of power and drawing wary eyes from neighboring realms. When the airborne calamity Charybdis is resurrected, Rimuru and his allies must coordinate brains and brawn to protect their new home and prove their place on the world stage.

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20. 20. 転生したらスライムだった件 8.5 公式設定資料集 [Tensei Shitara Slime Datta Ken 8.5]

    公式設定資料集

    

    An illustrated official setting guide that expands the series' world through character profiles, detailed artwork, maps and timelines, and explanations of magic, races, and politics; it supplements the main novels with short side stories and extra scenes, and includes creator/interview and production notes that reveal design choices, background details, and deeper context for key characters and events.