Before becoming a tree, the protagonist spent decades as a pink Slime named Queenie, slowly rolling through a forest, eating badgers, and eventually evolving into a massive Queen Slime and Fire Mage. This slow, methodical life taught the soul patience and the sheer absurdity of the skill shop, allowing them to hoard points for future exploits. After surviving as a human, a Catkin warlord, and that centuries-old Slime, the protagonist becomes Myr, a magical Sylphan Tree. When the Elven Princess Elaria flees her collapsing kingdom with the last seed of her people, she begs to bond with him as a Dryad. Myr confesses his bizarre reincarnation history in the darkness between lives, warning her that the bond might drag her soul into the cycle with him. Elaria binds her soul to his anyway. They spend centuries roaming the continent as a walking tree and his dryad rider, eventually attempting to cross the ocean to find the rest of her kin. They drown in a magical storm, but this death triggers a massive shift. The System fast-tracks their reincarnation, binding their souls together permanently. The story pivots from a solo progression fantasy into a dual-protagonist epic, as they begin reincarnating together as soulbound pairs, facing every bizarre race and continent as a unified front. This shared existence allows them to pool their absurd skill lists, creating combinations of magic and melee that break the fundamental rules of the world.

Reborn as Snow Kitsune, Kazuhiro and Ryoko exploit their absurd experience multipliers to kill an Eldritch Elder, earning a broken Divine Champion Trait that grants them millions of free attribute points. They carry this god-like power into their next lives as Shepherd Dogs, Bo and Bella. As dogs, they experience the simple joy of herding sheep and bonding with a naive Beastmaster, only for that peace to be violently ripped away. A rogue Soulmancer attacks, specifically targeting their souls, ripping away the Everlasting Bond trait and killing Bo. The loss triggers a blind, uncontrollable rage. The protagonist dies in a fit of grief, destroying innocent lives before a goddess literally smacks some sense into them. The System fast-tracks the reincarnation into a Wyvern named Nameless, who dive-bombs the Soulmancer's castle and obliterates him in seconds. This sequence proves their bond transcends the rules of reality. It also draws the attention of the goddess Adonite, who reveals the Pantheon is actively auditing the System. The floating man in blue robes, who operates the System, admits he had to manually alter their souls to hide them from the Pantheon's audits. This forces the duo to realize that their very existence is a cosmic crime, and they must hide their true nature while planning their next move against the gods.

Reborn as members of the hidden Fell race, Otonia and Krateros are completely cut off from the System. They must relearn magic from scratch, discovering that true magic uses experience directly, while the mana is a nerfed byproduct. The Fell live in a peaceful utopia at the Top of the World, completely unaware of the cosmic horror surrounding them. They view the System as a foul thing of nightmares, a bogeyman used to scare children. This isolation makes the revelation even more jarring, as the duo realizes their entire previous understanding of reality was a lie crafted by their jailers. Otonia revolutionizes Fell magic by creating inspired spells, including a math-computation enchantment and a material analysis spell. They learn the horrifying history of the world. The gods are titans who built the System as a literal farm to strip-mine souls for experience. The original enchantments were designed to harvest everything, until a clever demigod argued that leaving some experience for mortals would allow the crop to grow larger. Realizing the System is a thinking, evolving entity that artificially limits mortal power, they master true magic and map the Top of the World. When they eventually die and reincarnate as Otters, they carry this forbidden knowledge into a world where the gods are actively hunting anomalies. They use their new aquatic forms to hunt a massive sea monster named Robert, eating its brain to secure a victory that cements their status as apex predators who refuse to be harvested.

As Oni soldiers named Maxime and Theodore, the duo finds themselves in a brutal, genocidal total war against the Gobberton Republic. The Grand Defensive Alliance is forced to conscript children and strip civil rights just to hold the line against the endless waves of Gobberton soldiers. The sheer scale of the meat grinder forces the duo to abandon their usual subtle approach. They realize that diplomacy is useless against a society built entirely around a flawed, centuries-old mission statement. Through diplomatic infiltration, they learn a terrifying truth. Centuries ago, in a past life, the protagonists civilized the wild Goblins, giving them discipline and a unified purpose. Having wiped out all wild Goblins, the Gobbertons now view all other races as subjects to be benevolently conquered. The Republic's leaders are fanatics, driven by a sacred war that cannot be stopped through negotiation. Realizing their past good deeds created an unstoppable war machine, the duo makes a horrific choice. They hoard their experience points, intentionally staying at low levels to maintain their multipliers, and unleash a nuclear-level magical strike on the Gobberton capital. The explosion wipes out over a million citizens, committing genocide to save the rest of the continent. This gains them the Gobberton Genocide trait, painting them as ultimate threats to the favored races of the System. The moral weight of this decision haunts them, proving that in a world governed by a parasitic System, even the most well-intentioned actions can spiral into apocalyptic atrocities.