Evelyn's abrupt awakening in a shattered egg on an alien planet immediately plunges her into a fight for survival. Her new chitinous body, a grotesque answer to her mundane wish for "hotness," provides minimal protection against the acid-spitting sloth that attacks her. The caustic fluid burns through her exoskeleton, leaving a searing hole in her neck, a visceral reminder of her vulnerability. This pain, however, also reveals her first true power: slow, painful regeneration, fueled by the mysterious egg she instinctively devours. Desperate for connection, she discovers pheromones, a new sensory and communication system that allows her to project emotions. This leap of faith leads to her improbable friendship with Mr. Mooshi, a giant, placid pillbug, whose calm presence and slow, plodding movements offer her a temporary anchor in the chaos. Her first major triumph comes when she lures a predatory whip eel, the very creature that nearly dragged her to a watery death, into a trap with Mr. Mooshi's help. Eating the eel not only provides much-needed sustenance but unleashes a torrent of biological knowledge, giving her an intuitive, cellular-level understanding of the creature's anatomy and function. This visceral act of consumption is her first taste of true power, unlocking the horrifying potential of her new existence. The immediate consequence is a gnawing hunger for more knowledge, driving her to seek out new species to dissect and devour.

The surge of biological knowledge from the whip eel ignites a terrifying realization: Evelyn can not only understand life but design and create it. Her casual mental exercise of designing a "big strong Evelyn-monster hybrid" inadvertently manifests as Evelyn Experimental (EE), a larger, stronger version of herself that hatches from an egg. This accidental act of self-replication is followed by Evelyn Tinkerbell (ETB), a tiny, winged body born from a desire for flight. She now perceives the world through multiple consciousnesses, a dizzying, liberating, yet terrifying expansion of her mind. This newfound power is immediately tested when she encounters a colony of triloweasels, seemingly simple subterranean creatures, and brutally kills several to secure food and protect her cave. The act, initially driven by hunger and self-preservation, is abruptly recontextualized when her mind-link with a dying triloweasel reveals its sapience. She had murdered Hsthressis, a thinking, feeling person with a family and culture. The profound guilt and horror of this act shatters her burgeoning confidence, forcing her to confront the monstrous implications of her abilities and her casual disregard for alien life. The immediate tension is her desperate need to atone for Hsthressis's death, leading her to attempt an impossible resurrection.

Haunted by Hsthressis's death, Evelyn embarks on a desperate mission of atonement, attempting to negotiate with the Sthrenslians and revive their chieftain's daughter. Her initial interactions are a comedy of errors, marked by cultural misunderstandings, accidental blasphemy (like explaining photosynthesis as "eating the Fire of Khlasinas"), and her own overwhelming anxiety. She reveals her true nature as a multi-bodied hive mind, a concept that terrifies the Sthrenslians who perceive her as a soul-manipulating demon. The attempt to revive Hsthressis presents a profound ethical dilemma: Evelyn can only create a copy of Hsthressis's mind, linked to her own hive, raising questions of identity, autonomy, and the very nature of a soul. Despite her best intentions, Chlrehistra, Hsthressis's mother, banishes her daughter for renouncing Sss and aligning with Evelyn. Evelyn, now burdened with a bewildered Hsthressis, finds unexpected refuge with the Resonant Gems, a rival Sthrenslian clan facing starvation. She offers them food and assistance, using her powers to solve their humanitarian crisis, but her actions are driven by a desperate need for forgiveness and a safe place for Hsthressis, revealing the complex interplay of power, guilt, and compassion. This leaves her in a precarious position, having inadvertently started a war between Sthrenslian clans.

Evelyn's journey to save Warrior Katrk from a deadly infection pushes her to further embrace her monstrous capabilities, developing bacteriophages from her own body. This desperate act, however, forces her to confront the consequences of her power, as one of her own bodies dies in the process, a sacrifice she dismisses as a "setback." Back on Earth, her alien girlfriend, Tara, reveals her own similar origin: she too is a hive mind, brought to Earth and transformed by unknown entities. Tara's confession of having killed a human in self-defense, absorbing his biology to create new bodies, mirrors Evelyn's own journey of violence and adaptation. This shared experience deepens their bond, as they navigate the complexities of their monstrous identities and the ethical challenges of wielding god-like power. Tara's unwavering commitment to using her abilities for good, even as she confronts the horrors of human society (like a public execution for homosexuality), inspires Evelyn to reconcile with her own "monstrousness." This leads to a tender moment of mutual acceptance and love, as they officially become girlfriends, finding solace and strength in their shared, alien existence. The revelation of their combined potential for world-changing action, coupled with the dangers of both Earth and Acidsucks, sets the stage for their future, forcing them to decide how to wield their terrifying power.