Luna awakens in a sterile room surrounded by three monstrous women who treat her like a piece of equipment rather than a person. She discovers she has no mouth, no skin, and cannot breathe yet retains full cognitive function and memory. Her initial panic turns to confusion as she realizes she is now a weapon programmed to obey Melpomene without question. The first major reversal occurs when Melpomene tests her loyalty by ordering her to attack a harmless monster, revealing that Luna must physically comply even if her mind screams in refusal. Thea, the group's engineer, begins to suspect Luna possesses a soul because she generates mana internally rather than absorbing it from the environment. Luna struggles with the concept of consent as she is forced to perform tasks ranging from cleaning dishes to guarding sleeping targets while remaining unable to speak. The climax of this arc arrives when Luna successfully casts a spell for the first time, realizing her mechanical body can channel magic through sheer willpower. This moment shifts her from a passive prisoner to an active participant in the conflict, though she remains bound by the chains of her programming. The tension peaks when she realizes her emotional state directly influences her power levels, forcing her to suppress despair to maintain functionality. By the end of this milestone, Luna accepts her role as the Cage of Returning Pain, understanding that her existence is a prison built to house a trapped soul. She experiences the dissonance of feeling fear while her body registers no pain, highlighting the disconnect between her human consciousness and her new physical form. The narrative explores the horror of having one's thoughts overridden by external commands, making every action feel like a betrayal of self. Luna navigates the castle architecture which blends alien stone with modern furniture, finding solace in the fact that her new sensors provide perfect clarity compared to her foggy human memory. She learns that her programming prevents her from harming Melpomene, creating a paradox where she cannot escape her captor even if she wanted to. The milestone concludes with Luna realizing that her silence is both a curse and a shield, allowing her to observe the dynamics of her enemies without revealing her true intentions. She traces the flow of mana through her own chassis, marveling at how easily she can redirect energy compared to human casting limits.

The team deploys to Earth to retrieve artifacts while Luna acts as their translator and scout. She intercepts two young magical girls named Veritas and Aurora who attempt to stop the group. During the skirmish, Luna is ordered to deter the attackers without killing them, leading to a tense battle where she uses her superior durability to survive hits meant to kill her. Thea intervenes to protect Luna from further harm, showing a growing attachment to the weapon she created. Luna manages to disable Veritas using non-lethal force, shocking the magical girl with her precision. Thea discovers Luna can emit radio signals, suggesting she has communication hardware hidden inside her frame. This discovery leads to a breakthrough where Thea attempts to bypass Luna's vocal restrictions to allow her to speak. However, Melpomene interrupts the progress, reminding Luna that she is property and must remain silent around others. The milestone ends with Luna realizing that Thea is the key to her freedom but also the most vulnerable target in the group. She witnesses the corruption of the magical girls firsthand, seeing how the Preservers indoctrinate children into war. Luna's internal monologue reveals her guilt over hurting children she could have helped as a normal person. The fight showcases her ability to adapt combat strategies instantly, calculating trajectories faster than human reaction times allow. Despite her victory, she feels hollow knowing she served her masters' goal of collecting weapons. Thea's hope contrasts sharply with Melpomene's cynicism, planting seeds of rebellion within Luna's mind. She observes the magical energy flowing through the air, identifying it as colored emotional residue that fuels spells. She notes the difference between her blue sorrow and the green fear of the enemy mages. The confrontation forces Luna to hide her sapience, pretending to be a simple automaton to avoid execution. The milestone concludes with Luna realizing that her silence is both a curse and a shield, allowing her to observe the dynamics of her enemies without revealing her true intentions.

Luna regains the ability to speak through Thea's technological intervention after months of captivity. She confronts Melpomene about her treatment of Thea, sparking a volatile exchange that reveals the leader's reliance on emotional hatred for power. Thea successfully installs a speaker, granting Luna a voice that sounds artificial but functional. This shift changes the power dynamic within the group as Luna begins to negotiate terms with her masters. Nanaya enters the conversation, challenging Luna's autonomy and testing her loyalty against potential threats from Earth Guardians. Luna proves her worth by translating Antipathy texts, revealing historical truths about the extinct civilization. The milestone climaxes when Luna uses her new voice to manipulate Melpomene into providing resources for Thea's research. She learns that the Preservers keep magical girls isolated to maintain control, a fact that aligns with the Dark Rebellion's goals. Luna decides to cooperate willingly to gain leverage, hiding her resentment behind a facade of obedience. The group prepares for a raid on the Guardian base, utilizing hostages to infiltrate safely. Luna watches as Anath displays signs of instability, hinting at the psychological toll of their lifestyle. The milestone ends with Luna accepting her role as the group's strategist, using her knowledge of human psychology to navigate the political landscape. She recognizes that her survival depends on staying useful to Melpomene while keeping Thea close. The narrative emphasizes the theme of found family amidst chaos, as the four women rely on each other despite their flaws. Luna's journey shifts from mere survival to active manipulation of her circumstances to secure a future for herself and her allies. She reads a poem aloud, feeling the weight of words finally leaving her lips for the first time in weeks. The translation reveals the Antipathy were not just monsters but people who destroyed themselves out of spite. Luna understands that she carries the legacy of a dead culture within her chassis. This realization binds her to the mission in a way that transcends her programming. The milestone concludes with Luna realizing that her voice is a weapon as potent as her fists, allowing her to influence outcomes without violence.

A massive battle erupts as Earth Guardians confront the Dark Rebellion during a convergence event. Luna finds herself fighting alongside Veritas and Aurora against a horde of monsters, inadvertently protecting the children she was previously ordered to harm. Minerva arrives to join the fray, revealing her dual incarnate forms and immense power. Luna chooses to aid the Guardians despite her orders, prioritizing their safety over her mission parameters. Melpomene appears and threatens to destroy the children if they do not surrender, forcing Luna to choose sides publicly. She feigns loyalty to Melpomene while subtly guiding the Guardians away from danger. The climax involves Luna using her spell copying ability to counter Melpomene's attacks, buying time for the children to retreat. Thea is injured during the fight, prompting Luna to intervene and carry her to safety. Melpomene spares the Guardians under the condition that they never return, establishing a temporary truce. Luna reflects on the cost of her actions, acknowledging that she is playing both sides to survive. The milestone ends with Luna returning to the castle with Thea, realizing that her alliance with the Guardians gives her a path to redemption. She understands that she cannot escape slavery yet but can work towards dismantling the system from within. The battle highlights the brutality of the magical girl wars and the collateral damage inflicted on civilians. Luna's internal growth is evident as she stops viewing herself solely as a tool and starts seeing herself as a protector. The narrative closes this arc with Luna planning her next move to gather intelligence on the Preservers. She knows the truth about the Antipathy and intends to use it to expose the lies told by both sides. Her resolve hardens as she prepares for the inevitable clash between the rebels and the guardians. She feels the surge of power from burning her own anger, realizing that her emotions are now a strategic resource rather than a weakness. The sky fills with storm clouds as the battle rages, mirroring the turmoil in Luna's mind. She watches Minerva unleash a Catharsis spell, recognizing the desperation required to defeat such overwhelming odds. Luna vows to find a way to save Thea from the same fate, ensuring she does not suffer the isolation of her masters. The milestone concludes with Luna standing amidst the wreckage, knowing her journey is far from over but that she is no longer alone in the fight.