Fate/kaleid liner プリズマ☆イリヤ

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As Illya and her friends prepare for a trip to the beach, Mimi stumbles across Illya and Kuro doing their 'mana transfer'. Afterwards, Miyu comes over to Illya's house for a sleepover, where she acts bashful around Shirou.

Illya and her friends arrive at the beach alongside Shirou and his friend Issei Ryuudou. Whilst enjoying the beach, Miyu tells about how she has a brother, who Shirou resembles, before the girls come across Bazett, who is working part-time jobs to pay off her debts. Later, as everyone has a party to celebrate Illya, Miyu, and Kuro's birthdays, the celebrations are interrupted by some noisy construction from Rin and Luvia, who are attempting to dig for the eighth card, with Illya soon finding herself in the middle of an outrageous feud. Things become more troublesome when Ruby tries to inject Shirou with a love potion, though Sapphie soon sorts things out by erasing everyone's memories.

Plagued by thoughts of lewdness surrounding Illya and Kuro, Mimi starts putting her thoughts down into story, which soon turns into a gender-swapped boy's love story. This soon catches the attention of her classmate Suzuka Kurihara and her sister, who decide to use her story for a yaoi doujin. Concerned about Mimi's gradual transformation into a fujoshi, Suzuka asks Illya, Miyu, and Kuro for their help. Despite not being fond of Mimi's fascination with BL, Illya learns that it doesn't mean they can't still be friends.

Illya receives tickets to a theme park from Luvia and decides to go with her friends. When they lose track of Irisviel, who gets swept into a special event, they come across Caren, who agrees to be their substitute guardian. Later, Illya discovers the charm on her bracelet has gone missing, so Miyu decides to help her search for it. Taking some advice from Caren, Miyu manages to deduce the charm's location and find it before closing time. Afterwards, Kuro becomes curious about the relationship between Irisviel and Caren.

The girls attend the local summer festival, where Illya shows Miyu how to enjoy herself. Later, Rin and Luvia get into mischief in front of Shiro, while Illya uses her transformation to escape a wardrobe malfunction. Meanwhile, Kuro becomes aware that Miyu is hiding some kind of secret from Illya.

Having completed reconstruction of her mansion, Luvia invites everyone over for a house party, after which the girls discuss their plan to obtain the eighth card. As the girls prepare for what could be their final mission, Kuro questions Irisviel over how the cards are related to the Holy Grail War, which involved only seven classes. Ruling out the possibility of Irisviel being involved, Kuro suggests that they question Miyu, but Illya feels it is best to focus on the task at hand and find the answer themselves.

The girls are joined by Bazett, who reveals she had dispelled the curse of shared pain a while back, before entering the Mirror World, where they are confronted by the eighth card, shrouded by a black mist. Following their plan, Luvia restrains the enemy while Rin provides a mean to enhance Illya and Miyu's attack, providing an opening for Kuro to attack. However, the enemy manages to block it with a shield and counterattacks, forcing the girls to retreat while Bazett charges in, only to get stabbed by multiple swords wielded by the enemy. As Bazett fights using the Berserker's power, Illya and Kuro stay behind to give her a chance to strike, but are still unable to defeat it. Barely managing to escape, Bazett informs the others that the enemy possesses a second Archer card, before it suddenly appears in the real world.

Luvia collapses the ceiling onto the enemy so that everyone can escape, but it transforms itself into a craft that starts heading towards the city. Just then, the girls are approached by Caren, revealed to be an observer for the Holy Church, who had placed a bound field around the city to keep anyone from seeing anything, giving the girls an opportunity to rest. As Caren theorises that the creature is targeting the Holy Grail, with Kuro deducing it relates to a different Holy Grail War entirely, the enemy starts heading towards Mt. Enzou, where it uncovers a magic circle. While trying to push them out of it, Illya pushes out a human boy that was inside it.

As Caren experiences backflash from her observation spell, the boy, revealed to be the Heroic Spirit of the eighth card, reveals that Miyu is a princess from a parallel world who was born as a complete version of the Holy Grail. Feeling she can't escape her fate, Miyu gives Sapphire to Illya before being pulled into the vortex, completing the Heroic Spirit's ultimate form. Learning that Miyu is still alive inside the demon's body, Kuro and Bazett hold off the demon while Illya, gathering her resolve to rescue her friend, combines Ruby and Sapphire's power to unleash a powerful new transformation.

Using her new power, which puts her own body at risk, Illya fights back against the demon while Kuro and the others provide support. As the demon brings out his strongest sword, Ea, Illya uses her full power to defeat it and finally rescue Miyu. Following the battle, Illya and her friends get together to finish their summer homework, with Miyu more than happy to help. Meanwhile, Irisviel and Caren discover the crater has disappeared into a parallel world, where the eighth card is recovered by a mysterious pair.

The girls learn that the crater created in the mountain during their previous battle has mysteriously disappeared. While investigating the scene, they are suddenly confronted by two new adversaries who overwhelm them and kidnap Miyu. As Illya tries to chase after her, she finds herself in parallel world covered in snow, where she meets a peculiar girl known only as Tanaka. Despite seemingly having no other memories, Tanaka is somehow able to tell Illya that Miyu has been kidnapped by the Ainsworth Family.

Illya and Tanaka are attacked by one of Miyu's kidnappers, Beatrice Flowerchild, before she is suddenly called away. As Tanaka explains that the only thing she remembers is her duty to eliminate the Ainsworth family, she and Illya come across a ramen shop, where the owner explains that a gas explosion caused the crater. When they are suddenly faced with a hefty bill, they are bailed out by the Heroic Spirit Illya previously faced, Gilgamesh, who helps lead them to the Ainsworth's castle in the center of the crater. Making their way inside the castle, they come across a prison cell containing Miyu's older brother, who urges them to save Miyu. Just then, they are confronted by the other of Miyu's kidnappers, Angelica.

Gilgamesh steps up to face against Angelica while Illya and Tanaka go off in search for Miyu, only to come up against Beatrice again. As Tanaka takes on brutal attacks from Beatrice, Illya manages to find Ruby among a pile of weapons, transforming once again and installing the Caster card to fight against Beatrice's Berserker. After Tanaka takes on a full blast from Beatrice, still managing to survive, Gilgamesh helps her and Illya make a retreat. Just as Beatrice and Angelica catch up to them, they are called off by the head of the Ainsworth family, Darius Ainsworth, while Kuro and Bazett also arrive in the parallel world.

Kuro brings Illya and the others to the school, which she and Bazett had been using as a base. Kuro then explains their situation while Bazett gives Illya the Saber, Rider, and Lancer cards. As Gilgamesh explains to Bazett what the cards are, Kuro, notices Illya feeling sorry for herself, confronts her in a battle, forcing her to use the cards she received from Bazett to defend herself. During the battle, Kuro informs Illya that her fears of being in an unknown world are the same feelings Miyu kept to herself all the while. Winning the battle with the Saber card, Illya comes to understand what Kuro was teaching her.

Illya helps out a girl named Erica after she gets stuck on the school's walls and wets herself. As the girls take a bath together, they learn that Tanaka had lost her memories just before meeting Illya. Afterwards, as Sapphire manages to get in contact with Ruby, Erica is picked up by her father, who turns out to be Darius himself.

Darius traps Illya inside an ice barrier Noble Phantasm which slowly cuts off her oxygen supply. Tanaka manages to break through the barrier, allowing the others to come to Illya's aid, but they are all helpless to fight against Darius. After taking an interest in Tanaka's abilities, Darius takes his leave, with Erica leaving some disturbing words for Illya. As Illya and the others try to figure out their next move, Darius performs a painful ritual with Miyu. The next day, Kuro discovers that Illya has disappeared, leaving her Class Cards behind.

Illya wakes up to find she has been kidnapped by the Ainsworths who, after failing to brainwash her, transferred her mind into a stuffed animal, placing a fake personality in her original body. Managing to take control of her new plushy body, Illya tries to chase after her original body but is caught by Beatrice, who brings her to her room. Before Beatrice can rip her to shreds, Illya is saved by the arrival of Rin and Luvia, only to discover they have also been brainwashed into becoming maids. Escaping to the loft, Illya manages to find Sapphire, who gives her the power to transform.

Learning that injuring the possessed bodies will bring their original minds back, Illya, still powerless despite transforming, tries to fight against the possessed Rin and Luvia, who utilise nameless Noble Phantasms to fight against her. As they end up crashing into Erica's room, where Angelica finds them, Illya manages to use split-second timing to return to her original body. As Angelica uses displacement magic to overwhelm Illya, she reveals that the Ainsworths are trying to save their world, which is slowly dying, by using Miyu as the Holy Grail.

Angelica further explains the situation that because the world's decreasing mana is killing off lifeforms, the Ainsworths intend to use the Holy Grail to change humanity into a species that can survive in this new environment. Forced to use the Assassin Card to escape, Illya, conflicted over choosing between Miyu and humanity, is rescued by Kuro, who states her determination to save Miyu regardless of the situation. As Darius forces Miyu to watch everyone's battle, Illya comes to her own decision, stating her determination to save both Miyu and the world without sacrificing either.

As Gilgamesh and Bazett sneak up from behind, managing to bring Rin and Luvia back to their original bodies, Illya pushes ahead to confront Darius, using a card she received from Kuro to hit him with a dagger planned to cut off his magic, reuniting with Miyu in the process. However, emerging from Darius' body is his son, Julian, who reveals a large black cube in the sky and uses its dark power to consume Erica and create an army of Heroic Spirits. Just as the army seemingly overwhelms them, they are saved by the arrival of Miyu's brother, who bears a strong resemblance to Shirou.

Putting his own body at risk to use his Trace On ability to create weapons, Miyu's brother is aided by Kuro as he battles Angelica while the others fight off the Heroic Spirits. After Kuro manages to use teleportation to defeat Angelica, Miyu's brother goes after Julian but is heavily injured by a mysterious and deranged woman. As Miyu uses the Archer card to confront her, she becomes possessed by it until Gilgamesh retrieves it from her body. As Julian dispels the woman, Illya brings out her full power in an all-out attack.

As Illya's attack fails to stop the regenerating army, Tanaka throws a mysterious sword into the middle of the fray, allowing Illya to damage the black cube and dispel the muck causing the army to grow. As Julian escapes with Erica and Beatrice, Bazett manages to retrieve a gem allowing Rin to properly heal Miyu's brother. After everyone, including Angelica, returns to Miyu's home, Illya and Kuro discover the sword she used was actually Tanaka's arm. While Julian prepares his vengeance, Miyu and her brother tell the others about what happened to them.