Written by Yuichiro Higashide.
Rayshifting to the coordinates where the fake Mona Lisa originated from, our four heroes quickly encounter Caesar and Paracelsus, and a fight breaks out before anyone knows who's responsible for anything. After their defeat, Caesar and Paracelsus reveal that they're innocent, and were investigating the counterfeiter (along with planning to use the other as a decoy) before the protagonist and company showed up. Before retreating, Caesar tells them that a Servant is running the counterfeit workshop.
Arriving at the fake workshop they find that it not only looks just like the real one, it also has more counterfeit works than just the Mona Lisa. In the process of gathering them, counterfeit enemies appear, followed by an enemy Servant. Dr. Roman and Emiya sense that the Servant's Spirit Origin has also been counterfeited. The Alexander who appears affirms that he is indeed a fake, though he doesn't mind. He's meant to be "a talented little stepbrother who adores the big sister living with him", a role he plays with gusto. Making note that the counterfeiter is a woman, the party fights Fake Alexander. Before he fades, Fake Alexander tells them that there are fake workshops selling counterfeit Da Vinci works in many locations, though he doesn't know what his Master's goal is.
Relying on Emiya's tracking abilities, the party finds a Fake Hektor in the cold North, spreading more counterfeits. When asked what his goal is, he replies that he only wants to pat his Master's head. After all, he's "a friendly, free-spirited older man who's back from overseas, who may of may not be related by blood". His Master, whoever she is, seems to want to be spoiled with kindness. Da Vinci is intrigued, but can't forgive the unknown Master for trying to surpass her skill through repeated counterfeiting. After Fake Hektor is defeated, Emiya confirms that the eventual goal of a counterfeiter is just that— he would know, after all. Da Vinci tastes the paint of one of the false copies, and concludes they must go to the beach.
Arriving at the seashore at nighttime, the party finds a Fake Siegfried. Though Mash believes he'll be as humble as the real thing, Fake Siegfried has concluded that he must use his pride to surpass his real counterpart. After all, his Master wants him to be bolder. Da Vinci wonders about this unknown Master, and concludes she's like a dried fresco, never changing. The party defeats Fake Siegfried, but he was just a distraction. Fake Siegfried refuses to apologize, as a sudden long range attack flies towards the party.
Some distance away, Fake Arash and Fake Arjuna discuss their Master, and her habit of not listening, though their talk is interrupted by the realization that their prey is still alive. The protagonist and Da Vinci were protected by Mash's Lord Chaldeas and Emiya's Rho Aias. Fake Siegfried is not so lucky, and dies from the friendly fire. Emiya notes that they didn't use their Noble Phantasms, which Fake Arash claims would make his Master cry. Da Vinci has a question for the two false Heroic Spirits: what role did their Master give them? Fake Arjuna claims to be "a very sadistic science major upperclassman who gets all lovey-dovey when it matters most". Fake Arash claims to be the "older childhood friend who's a humanities major and lives next door", and adds that Fake Siegfried was "the friendly class celebrity who, by coincidence, sits next to you in class". Fake Arjuna then tells the party that they should focus on restoring the human order, not chasing after the counterfeiter. Da Vinci concludes that she isn't willing to risk the protagonist for her pride, but they disagree. With their current goal reaffirmed, another battle commences and ends in Chaldea's favor. As Fake Arash and Fake Arjuna fade away, Da Vinci infers that the counterfeiter is at an art museum, specifically the Louvre, and thanks the protagonist for supporting her.
Arriving at the counterfeit Louvre, the party has slowly realized who the counterfeiter is, and their suspicions are confirmed when they encounter a Fake Gilles de Rais (Caster). Or rather, "a sad father who was loved by his daughter when she was a kid, but is now hated by her since she became a rebellious teenager", as he calls himself. Fake Gilles implores the party to leave, but they refuse, wanting to hear his "daughter"/Master's motives from herself (they already kind of understand them). After his defeat, Fake Gilles claims his Master only wanted to be an individual, and not a counterfeit she was created to be. The party takes a breather, knowing who their final enemy is, but not who the seventh fake Servant is. After speculating on some male Servants, they advance to the final battle.
The party sneaks towards a room where angry and lustful voices are coming from. At the count of three, they burst in— and find that all their guesses on who the final fake Servant was were wrong, and also a Fake Brynhild hugging a struggling Jeanne Alter. The moment goes from heroic to awkward, before Jeanne Alter kicks Fake Brynhild off of her and turns to confront her foes. Unfortunately for her, Fake Brynhild comes back like a Teke Teke ghost and and declares her love for her Master. Jeanne Alter despairs, not knowing how her wish went so wrong. After beating up the fake Valkyrie (who disturbingly enjoys it), Jeanne Alter calms down and turns to the protagonist, complimenting them for being able to find her. Emiya tells her that she shouldn't have been able to be summoned again, which she agrees— it was Jeanne d'Arc's own popularity that made the idea of a vengeful version of her exist in the human consciousness. Now that she's back, she seeks to surpass the original Jeanne, and has summoned herself as an Avenger to do so. Emiya once again interrupts her, this time to inform her that all she's done is make herself into the protagonist of an otome game. Mash agrees, realizing that Fake Brynhild is meant to be "an honest friend who's the same sex as you". This only sets Jeanne Alter off, and so she and Fake Brynhild attack the party— but they lose. Before she fades, Fake Brynhild tells Jeanne Alter that contrary to what she may think, she and the other fake Heroic Spirits really did love her.
With all the fake Heroic Spirits gone, Jeanne Alter claims that she only made them for her own amusement. Nobody believes her, and Da Vinci and tells her that no matter how fake they were, their feelings for her were real. The protagonist agrees with this, setting Jeanne Alter off again. This time, she screams that no one could ever possibly love someone as twisted and wrathful as her. In the face of all her rage, despair, and all the threats she made to them in the past, the protagonist tells her that they would accept her as their Servant. Her pride crushed once more, Jeanne Alter's face twists from longing, to anger, to longing again, before suddenly calming down. She admits that she feels inferior to Jeanne, that she wants to be loved, and that her rage will never go away. She tells the protagonist that she will accept them as her Master— in another day. Today, she will fight them to the death, as they did destroy all her hard work and shatter her pride. Though the protagonist is dismayed by this, Da Vinci reminds them that this is Jeanne Alter's nature, and that she'd hate them if they didn't allow her to salvage her dignity. The protagonist's resolve is reignited, and Jeanne Alter is overjoyed at the familiar sight of their defiant expression. Summoning several wyverns, she rushes into one last battle.
Upon her defeat, Jeanne Alter is satisfied, except for one last thing. She tells the protagonist that a future version of her will bond with them, but the current version of her will fade away. When she does, she leaves behind a Holy Grail fragment, explaining how she made her counterfeits. With a few last poignant thoughts on Jeanne Alter, the party prepares to go back to Chaldea. Da Vinci is relieved, as she wants to go back to being a shut-in. Unfortunately for her, Mash, Emiya, and the protagonist aren't willing to let her off now that they know she can fight. The event ends with Da Vinci protesting the thought of permanently joining the protagonist's battle party.
Tropes:
- Abhorrent Admirer: Jeanne Alter is disgusted by the fake Brynhild being in love with her.
- Call-Back: On the possibility that one of the Fakes could be Elizabeth Bathory, suddenly Emiya shudders remembering about a certain horrific musical number at sea...
- Childhood Friend Romance: Fake Arash's role is Jeanne Alter's older childhood friend that's a humanity major and lives next door.
- Cool Uncle: Fake Hector's role in a nutshell with the added bonus of potentially not being blood related to her.
- Debut Queue: Although Da Vinci is usable as a proper heroic Servant in support this time, the biggest honor goes to Jeanne Alter, who had previously shown up as a Ruler-class servant. This time, she's present as an Avenger.
- Distracted by the Sexy: Da Vinci promptly loses all focus when she meets Alexander and is obsessed over how cute he is.
- Gay Option: Fake Brynhild fills this role in Jeanne Alter's gang, something that wasn't initially intended. As Brynhild claims, though, this wasn't a result of any kind of magic; she fell in love of her own accord.
- Harem Genre: Emiya can right away tell, probably from experience, that all the fake heroic spirits Jeanne Alter summoned was meant to be her harem with Brynhild meant to be her best friend.
- Idiot Hair: While some of the "fake" monsters are a different type of creature (i.e. snowmen instead of golems), others are the original model with an ahoge attached.
- I Just Want to Be Loved: The protagonists can tell that Jeanne Alter created the fake heroic spirits because she wanted to be loved.
- Little Sister Heroine: Fake Alexander is a gender inverted example with his role being Jeanne Alter's stepbrother who adores her.
- My Rules Are Not Your Rules: The 7 fake heroic spirits that are summoned by Jeanne Alter are summoned in a different class - Alexander (normally Rider, summoned as Saber), Hector (normally Lancer, summoned as Rider), Siegfried (normally Saber, summoned as Archer), Arjuna (normally Archer, summoned as Assassin), Arash (also normally Archer, summoned as Caster), Caster Gilles (summoned as Lancer) and Brynhild (normally Lancer, summoned as Berserker). "Fake" versions of D'Eon (Rider), Diarmund (Assassin), Phantom of the Opera (Berserker), and Leonidas (Caster) also show up, although not part of the 7 spirits Jeanne Alter summoned.
- Never Trust a Title: Although the event does involve 7 Counterfeit Heroic Spirits and Da Vinci, a much more accurate title for the event would be "Jeanne Alter and the 7 Counterfeit Heroic Spirits".
- NOT!: In a more hilarious segment, Fake Siegfried apologizes for having to fight, only not so much... The last part is even emphasized by his sprite zooming onto his face.I am very sorry that we have to fight... NOT!!
- School Idol: Fake Siegfried's role was the class idol that happened to sit next to Jeanne Alter in class.
- Too Kinky to Torture: Jeanne Alter's attempt to shut up Brynhild by kicking her around and stepping on her just makes her even more eager.
- Tsundere:
- Fake Arjuna's role is the sadistic science major upperclassman that gets lovey dovey when it makes most. Apparently Jeanne Alter used the term tsun when describing his role.
- Jeanne Alter herself is established in this event to be one in a big way, which is a big departure from her original evil persona in the First Singularity.
