Shizuku Kurogane/History

History
Ikki's younger sister, and as a child, Shizuku is the only family member of Ikki other than Ryoma to have never discriminated against him nor was she aware that her brother is being discriminated by her family, resulting in their close relationship.

After Ikki left the house, Shizuku was shocked and sadden over her ignorance to see her family showing no concern over Ikki leaving as he was viewed as non-existing to them. This event eventually resulted in Shizuku hating and distrusting other people and her extreme attachment towards Ikki.

It is later revealed that Shizuku had always had a distaste for humans, ever since she was a child, as they would usually bend to power, as she would usually get away with anything she did, because the adults used their power to make it so. This however eventually led to her first time meeting Ikki as he was the first actual human to not bend to adult power, and told her what she did was wrong.

New Term, Reunion and Rebellion
Shizuku, on her first day at Hagun Academy, is first seen          embracing her brother lovingly, kissing him in front of everyone much to the shock of everyone present with Stella stepping in to keep Shizuku away from Ikki. Shizuku disliking the interference proceeds to argue with Stella and was shocked to learn that Stella is Ikki's "slave". Denying the fact, Shizuku brings out her Device and fights Stella as they ended up destroying the entire class room, which caused them both to be placed under house arrest for 1 week.

Following that incident, Shizuku is seen in her room with her roommate, Nagi Arisuin, who comforts her and helps her with her make over for her outing with Ikki. She then invites him along, as the outing was already ruined with Stella inviting herself, and Nagi would be able to give her support, when needed. The next day, Shizuku shows up with Nagi, meeting Ikki and Stella who were waiting for them. Shizuku then heads to the mall with them. As the four of them walks around the mall while waiting for their movie to start. Shizuku is then left alone with Stella, when Ikki and Nagi went to the bathroom until Rebellion shows up.

Shizuku is next seen with Stella, being used as hostages, with the other hostages. When Stella stands up to protect a woman and her child, Shizuku proceeds to make her preparation in making a barriers, messaging her brother and Nagi beforehand as Shizuku signals the counterattack by activating her Noble Art, allowing Ikki to make his move and defeat Bishou. Shizuku is then asked by Ikki to heal Bishou as he will probably bleed out. Shizuku agrees but is interrupted by a member of rebellion, who was hiding in the crowd with a hostage at hand. Now with the advantage, Bishou tried forcing Shizuku to heal her. This however became void, as Bishou and the rebellion member is shot down, by Shizuya Kirihara.

Debut Battle
One night after the Rebellion incident, Shizuku enters her first Selection Battle being victorious. She was then seen cheering for Ikki during his match against Kirihara. When Ikki was taken to the hospital for emergency aid, Shizuku decides to stay behind to allow Ikki and Stella have their own private time.

Impossible Victory, Decisive Battle, and New Beginnings
Two days after Ikki is victorious against Kuraudo, Shizuku learns about her next opponent for the selection battles, Tohka Todo. She then goes to the training grounds, of the school, where she defeats fifty opponents with ease, not having much of a challenge against them.

Raikiri vs Lorelei
Shizuku then goes to the arena, where she faces the strongest knight in the entire school, Tohka Todo. Shizuku tries to fight Tohka through strategy and cunning, and although gallant, her efforts were for not as she was easily overpowered by Tohka and her Noble Art Raikiri. Shizuku then wakes up in the infirmary. She is then hugged by Nagi, who tells her that her brother was proud of her efforts. With the frustration of losing the match and hearing what Nagi said, Shizuku begins to cry, while holding onto Nagi tightly.

Siege, Reunion and Trap
Shizuku is then seen in the student council room, after being invited by Tohka, talking with Tohka, who wanted Shizuku to convince her brother, Ikki, not to fight in their battle tomorrow, knowing how injured he will be. Shizuku had decided to not answer, wanting the night to think it over.

Shizuku was then seen greeting her brother at the gate, and had told him that, although she is against him continuing to fight, she knows that him fighting against Tohka would be best for him, encouraging him to keep on fighting instead.

She had then sat in the stands, with Stella, cheering for Ikki, as Ikki had fought against Tohka, although she was scared at the possibility of her brother dying in this battle. When Ikki had won, Shizuku was still frozen, and was unable to go congratulate her brother after his victory.

Training Camp and Scheme
Shizuku helps in the healing with the training camp, during the training camp for the Seven sword art festival.

During the night of the final day, Shizuku and Nagi had shared a drink and Shizuku points out that this was the first time had actually opened up to anybody, much to Nagi's surprise.

Akatsuki Strikes
Shizuku while on the bus back to Hagun, along with the participants for the festival, learns that Nagi is an assassin for Akatsuki. Shizuku points out that it didn't make any sense for Nagi to reveal himself now, leading to others to believe in Nagi.

They had arrived to a destroyed Hagun Academy, and were able to defeat the invading Akatsuki members. Nagi is then struck by Amane and then it is revealed that the Akatsuki members they had struck down weren't actual ones but instead wooden puppets made by Sara Bloodlily. Shizuku chases after Hiraga who had taken Nagi's unconscious body to Akatsuki Academy, being helped by Ikki.

Shizuku leaves Ikki to fight against an unknown powerful swordsman, as she confronts the "One Armed Swordsman" Wallenstein. Shizuku was outmatched for most of the fight and Wallenstein was able to actually cut her in half. However, Shizuku reveals her new Noble Art, Aoiro Rinne, which allowed her to turn her very being into water, and was even able to manipulate the air that Wallenstein breathed, causing him to actual drown on land. She then finishes Wallenstein by destroying his very insides, saving Nagi from a terrible fate.

Shizuku, after the incident, learns the some members of Hagun Academy's participants for the seven sword festival had dropped out, allowing room for her to participate. She gleefully accepts the invitation and was now a formal participant of the Seven sword art festival.

Party Crashers
Shizuku joins her brother in a party, which was held for the representatives of the seven sword art festival. There she met two Akatsuki members Sara and Rinna, who seemed both a bit to weird for Shizuku to actual consider to be terrorist. After the two had left the party Shizuku and Ikki were then met with Yui Tatara, who is someone with malicious intentions. This is proven as Shizuku was nearly harmed by Yui, who tried too feed her meat with metal blades in it. She is saved, however, by Ikki who nearly fought with her. The confrontation however, does not happen as other representatives intervene, causing Yui to leave in disgrace.

Dinner and confrontation
Shizuku, Ikki and Nagi are then invited to lunch by Yudai, the Seven Stars Sword King himself. There they met Kiriko, one of the representatives at the Festival, who joined them for lunch. After lunch Ikki separated from the group leaving Nagi, Shizuku and Kiriko. Shizuku is confident that her brother will beat Yudai but Kiriko soon dismisses such idea, she then explains to Shizuku why.

Battle of Kings
Shizuku and Nagi are seen cheering for Ikki from the stands. Kiriko then meets with them, telling them that Ikki seemed nervous, causing Shizuku to remember what Kiriko had said to them, being that Yudai was fighting for his little sister, who was unable to speak because of an accident she believed she caused.

Shizuku at the start of the battle became worried that Ikki was not going to win, believing the thing that had stopped his assured victory against Yudai was Punch eye. That, however, was not the case as Ikki was simply having trouble using Edelweiss' own swordsmanship he didn't know. The tide of battle soon changes causing Yudai's little sister to leave, not being able to bare seeing her brother in pain. Shizuku chases after her and meets her in the hall, convincing her that she needed to be strong for her brother causing Koume, Yudai's little sister, to come back and watch her brother. Shizuku then cheers as her brother is able to defeat Yudai once and for all.

One vs Four
Shizuku later watches Stella's match against the rest of the Block B participants. Stella wins the match, which leaves Shizuku impressed, although she doesn't admit it.

Conclusion of the First Match
After Stella's match Amane Shinomiya, approaches Shizuku, Ikki, Nagi and Kiriko. He tries approaching Ikki, but Shizuku stops him, telling him that Ikki doesn't like Amane. Kiriko who is supposed to fight Amane, is then forced to withdraw from the Festival, due to her patients entering critical condition. This is revealed being due to Amane's Noble Art, Nameless Glory, which can manipulate future events. Shizuku also wins her match, although it's not shown.

The Rowdy Medical Room
Shizuku later fights against Momiji Asagi, in the second round of the Festival. Momiji uses Trackless Step, which makes her undetectable by Shizuku. Shizuku though counters the Trackless Step, by spreading extremely thin water across the arena, through which she can sense Momiji's movements. This allows Shizuku to defeat Momiji, leading to her advancing in to the quarter-finals, of the Festival, where Shizuku will fight Amane.

The Warriors' Slightly Boisterous Break
Shizuku, along with Ikki, Stella, Nagi and the Akatsuki member Sara Bloodlily, later goes shopping. While they are shopping, Shizuku suggests to help Stella, in picking an outfit that will appeal to Ikki, claiming that she actually wants to support now. However, Shizuku picks her a bunny costume, which Ikki doesn't approve of. Realizing that Shizuku tricked her, Stella quickly goes to change, while Shizuku leaves with Nagi, wanting to prepare for her match against Amane.

A Fresh Bloody Truth
Shizuku later tells Nagi about her plan to defeat Amane. She is planning to attack Amane before the start of their match. This will leave Shizuku disqualified, but it should leave Amane unable to fight in the Festival. Nagi agrees to help Shizuku in her plan, as she is his friend.

Shizuku and Nagi attack Amane, who is in the waiting room, waiting for the start of his match. Shizuku pierces Amane's body with multiple icicles. Amane though survives this, which leads to Nagi trying to use his Shadow Bind to bind Amane. Just then the lights in the room temporarily go out, making Nagi's shadow abilities useless. Amane then pierces his body with multiple swords.The enraged Shizuku then attacks Amane, but is unable to hit him, due to Amane's Nameless Glory. Amane then pierces Shizuku with multiple swords. Then a camera in the room starts to broadcast footage of the beaten Shizuku, and Amane reveals to everyone her love for Ikki. Shizuku is saved by Stella, who also makes Amane stop. Due to her actions Shizuku is disqualified from the Festival, and Amane advances into the semi-finals, where he will face Ikki.

Shizuku and Nagi later recover from their injuries and watch the match between Amane and Ikki, which Ikki wins.

The Finals of the Seven Stars Sword Art Festival
Shizuku later watches the finals of the Seven Stars Sword Art Festival, where Ikki faces Stella. After a long and hard battle Ikki finally wins, which leads to him becoming the winner of the Festival.

Shizuku later meets Stella and Ikki in the hospital room, after they had sex. Shizuku reveals what they have done, and furiously attacks Stella. Shizuku is later present in the crowning of Ikki as the Seven Stars Sword King.

The Festival is Over
Shizuku later participates in the party after the Festival. She also goes to the bathhouse, along with the rest of the female participants.

"Lorelei" and the "White-Robed Knight"
Shizuku later visits the Yakushi General Hospital and meets Kiriko Yakushi. Shizuku asks her if she can teach her in healing techniques, to which Kiriko agrees on one condition. The condition is that Kiriko can give Shizuku treatment, because her body has become distorted from using Aoiro Rinne. Shizuku agrees to get treatment, despite Kiriko informing her that the treatment will be very painful. Kiriko then begins her treatment of Shizuku.