First Manga Appearance: Chapter 92
Name Meaning: Nagisa=beach; shore
Gangs: Oni-baku Gumi
School:Shonan Fujisawa Girls' Institute
Transportation: Honda Duo
Occupation: Waitress at Dolphin Seaside Cafe
Notable Features: Suffers from dissociative identity disorder; a good cook
Tttended Shonan Fujisawa Girls' Intitute & was quite popular with the boys, including a friend of Takada. She caught the eye of the 2nd generation leader of Midnight Angel, Akutsu Junya, who kidnapped her & she was declared missing. She became Akutsu's new girl, whom Akutsu had done terrible things to. He abused her so much that she was too messed up to run away.
Takada's friend arrived at Akutsu's apartment sometime after to save her but the girl he met at there was a completely different girl, with tons of makeup & dyed brown hair. He gets interrupted by Akutsu & gets hit by Nagisa, who calls herself Yasha. A Hannya tattoo appears on her left shoulder whenever Yasha comes out. Driving herself out & replacing herself with someone who loves Akutsu was the only way she could save herself. Yasha disappeared when Akutsu was put away & she returned home after 2 months, with no memory of what had happened.
Two years later, she works as a waitress at the Dolphin Seaside Cafe, known for its g-stringed waitresses & catches the attention of Ryuji. While on her shift, she is dragged away by 2 Yakuza men & Yasha switches out to beat them up. Ryuji sees her tattoo & the “Midnight Angel” sticker on her Eliminator 750 as she rides off. Ryuji watches her at her next shift at the cafe & she apologises to him for suddenly disappearing. She slaps him when he rips off her top to find the tattoo, which is nowhere to be seen.
That night, Yasha switches out & attacks a group of Hiratsuka Idaten gang members. She scrawls the words “Divine Punishment” across the road at the bloody scene. Sometime after, as Yasha, she comes looking for Ryuji & introduces herself, while stating that she is not familiar with the name Nagisa when asked. She informs him that Midnight Angel is alive & rides off. Ryuji is shocked to see her in Midnight Angel trooper uniform.
She is pursued by Ryuji & quickly shakes him off her tail by sliding under an oncoming truck. She switches back to Nagisa & walks pass Ryuji, who tears off her top to find no tattoo. She starts to cry, not knowing anything about Midnight Angel or Yasha. She meets Ryuji the following day & asks him to go on a date with her, telling him to meet her on Saturday at 7PM at Kaihin Park. She accidentally drops her wallet, which is picked up by Ryuji.
As Yasha, she next attacks Takada, an old 3rd generation Midnight Angel leader & overturns his car. She informs him that she is Midnight Angel's next generation & is spotted by Eikichi as she rides off. Eikichi later visits her house after picking up her wallet from Ryuji & sees a seemingly normal girl who drives a Honda Duo excited about her date. However, upon seeing a bloody wooden stick in her wardrobe, Yasha takes control & attacks Eikichi when he finds her hidden Eliminator 750 & rides off to meet Ryuji.
She meets Ryuji & attempts to attack him while his back is turned. However, she breaks down & screams as Nagisa tries to break out & warns Ryuji to run. As Ryuji helps her up, her tattoo returns & as Yasha, she hits Ryuji over the head. She reveals that she & Nagisa are one in the same, but Ryuji won't live long to find out. Behind her, more Midnight Angel members approach to finish off Ryuji. She rides off as Ryuji fends off his attackers.
Ryuji chases after her & falls for her trap, a piece of wire stretched out across the road, causing his bike to flip. Leaving the unconscious Ryuji, she finds Kamishima & attacks him from behind & informs Eikichi that he is next. She attacks Eikichi along with more Midnight Angel members as well as Kamishima's Kamakura Massacre Unit. The police arrive to stop the fight & she rides off, not before informing Kamishima of Akutsu's release.
As Nagisa, she visits Ryuji in the hospital & is attacked by Eikichi, from which she deduces that she is responsible for Ryuji's injuries. As she sits outside in the rain crying, Takada reveals to everyone about her angel/demon relationship with Yasha. Upon hearing the whole story, Ryuji realises that Nagisa briefly appeared to warn him of Yasha. She sits waiting in the storm until Ryuji comes out so she can apologise to him, revealing that she is aware of her condition & often wakes up with blood on her clothes with no memories.
She tells Ryuji that she loves him & that she doesn't want to hurt him anymore. She jumps in front of an oncoming car but is saved by Ryuji. She begs Ryuji for help & he promises her that he will definitely save her. She stays with Ryuji at his sister, Yoko's, apartment. She catches Ryuji renting adult videos and later tells him that she is willing to have sex with him. They are interrupted by fireworks outside & they watch it in each other's arms, with Ryuji promising to get rid of Yasha for her.
She goes to the beach with Ryuji, Eikichi & Shinomi & Eikichi tries various ways to brings out Yasha, much to Ryuji's annoyance. At the end of the day, Yasha resurfaces by the sound of Eikichi's bike & she attacks Ryuji & runs off. She bumps into Akutsu, who has been released & rides off with him. She takes Akutsu to the Kawasaki FX-ZII that she kept for him & the two start planning Akutsu's return.
They ride through the city with Midnight Angel to show that Midnight Angel has returned & are interrupted by Kamishima with his Kamakura Massacre Unit & Ryuji, Katsuyuki & the K. T. Butai. She attacks Ryuji, stating that she will kill anyone who gets in Akutsu's way. The police arrive to stop the fight & Ryuji knocks her unconscious. She is taken away & kept at Yoko's apartment. She is saved by Akutsu, who attacks Yoko in Ryuji's absence. She leaves with Akutsu after he challenges Ryuji to a fight for Masaki's coat.
She helps Akutsu set up a trap for the Kamakura Massacre Unit & the Oni-baku Gumi to fight each other & appears with Midnight Angel to take out both gangs. She lures Ryuji into a cabin where Akutsu plan to set him up for murdering Kamishima. As she is about to finish Ryuji off, Nagisa breaks out & stops her. Nagisa tells Ryuji that she loves him & jumps in front to take a knife for him. Ryuji protects her from burns as Akutsu escapes & blows up the cabin.
She is taken to hospital in critical condition. She regains consciousness & informs the police that Akutsu was the culprit for burning Kamishima, not Ryuji. Although her operation went smoothly, she starts coughing up blood, struggling to fight off Yasha. Her pulse becomes critically unstable & her hearts stops. Although she is announced dead by the doctors, Ryuji persistently calls out to her & she mutters Ryuji's name as she opens up her eyes.
After the Midnight Angel arc, she befriends the Oni-baku Gumi & she & Ryuji officially becomes a couple. Her parents disprove of her dating Ryuji & she runs away from home. She is surprised to find out that Ryuji has also run away from home & they both find an abandoned bus at the park to live in. With the Oni-baku Gumi's help, the bus is made into a liveable place. That night as everyone falls asleep after celebrating the bus' completion, she & Ryuji have sex for the 1st time.
During the Yokohama Calvary arc, she gets ambushed by Nakagaki & Mauchi at the bus, who grags in a bloody Saejima with them. Upon Ryuji's arrival, they hold Nagisa hostage & start smashing up the place. The 2 Yokohama Calvary leaders start attacking Ryuji & they are saved by Natsu. They are joined by more Yokohama mobsters & are interrupted by Nakajo & the Shonan gangs, causing the Yokohama Calvary to withdraw temporarily.
They fix the bus' damage sometime after & she finds Ryuji's old photos of Ayumi, his previous girlfriend. She becomes jealous & gets angry when Ryuji mentions Ayumi on their 1 month anniversary date. She rejects his gift upon finding out that it is the same outfit that Ayumi was wearing in one of the photos. She is saved by Ryuji from 2 harassing guys & realises how cool he is & how much she loved him, believing him to be the strongest, coolest, manliest & also kindest in Shonan.
During the Yagyo Atsuki arc, her bus is trashed by Yagyo Atsuki’s demons when Ryuji leaves her home alone to go buy condoms. Although she remains unharmed, Ryuji takes her to Yoko’s apartment & swears revenge on Yagyo Atsuki. During Shinomi’s quest to find the pink elephant, it is revealed that Ryuji has shown the pink elephant to Nagisa.