Xenoblade Highschool AU Idea

Been thinking on this for a while, and thought of posting the idea so it'd stop bothering me.
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Fiora: Wall flower of the school, she is rather shy, and keeps mostly to herself. She is withdrawn due to Dunbans' over-protectiveness, and knowing how he reacts when it comes to her keeps a distance from people so they won't get hurt.

Shulk: Transfer student to Fioras' school, he is a nerdy kind of guy, but he has attracted a lot of girls due to his kindness. He has a special affection for Fiora due to her looking familiar, and he can't help but befriend her. He gets along with Reyn and Sharla on the spot, and protect's Fiora on countless occasion's from Zanza. He lives with his older brother Alvis, as they moved after Dickson passed away.

Reyn: Star player of the Football team, best friend of Shulk, and currently dating Sharla. Him and Sharla have protected Fiora, unknown to her, for every time Zanza would try to approach her when she wasn't looking, Reyn and Sharla usually stopped him with Reyn holding Zanza, and Sharla beating the crap out of Zanza. Reyn, Sharla, and Shulk get Fiora to soon open herself up, and she becomes a cheery, bright, and outgoing girl.

Sharla: Reyns' girlfriend, secret protector of Fiora, and hurts anyone who hurts her friends. Her Uncle Otharon look after her and Juju who idolize's Reyn. After Gadolt was killed oversea's, Sharla soon meet Reyn and the two started a relationship after 2 years of knowing one another.

Dunban: Older brother of Fiora, very protective, and a Military retiree. He retired after a wound left him with a unusable arm, and a slight limp if he's standing too long. He knows Alvis from his past as he vaguely remembers Shulk, but knew Dickson very well. He won't deny he threatened Shulk about his little sister, but he was surprised when Shulk just gave him an unfazed look. He respects Reyn, Sharla, and Shulk, and is secretly dating Melia.

Melia: School nurse, graduated a year early, extremely smart, and is Fioras' most trusted friend. She helps patch Fiora up after an encounter with Zanza as the man abuses her every time he see's her when someone interferes. She was the one who told Dunban about Zanza's treatment to Fiora, and she is secretly dating Dunban to keep it hidden from her family as she's from a rich family.

Riki: A energetic, funny, easy going teacher who laughs a lot, and constantly talks about nature. He is the geology teacher, and see's it funny whenever Reyn and Sharla start flirting, but picks on Reyn a lot, usually causing Reyn to call him weird, which usually results in Reyn being hit with a marker or...on rare occasion's...a book.

Zanza: School bully, and makes many advance's of Fiora, wanting her to be his. They had dated for a while, but after Fiora realized how controlling he was, she broke the relationship off, but it caused him to hit her. It's another reason to her being withdrawn. He ends up kidnapping Fiora when she least expects it.

Meyneth: Homeroom teacher who adore's Fiora, and tries to protect her, but she sometimes takes over a Principle of the school whenever Egil is sick, the two being in a relationship. Meyneth is the one who speaks to Dunban if something is ever wrong with Fiora.
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In this story there are no machina, nor Nopon, but the High Entia and Homs exist. Imagine Riki has a human with peach skin, and tan hair that eventually turns pink. (Seeing as that's how his hair actually is...) He also has pink eyes, and hates Reyn. LOL
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Shulk is a new student to school, and amazingly befriends the wall flower Fiora, who showed him around the school. After an incident with Zanza, the school bully; Reyn and Sharla soon befriend her as well, and learn of her relationship with her brother, and Melia the school nurse. After Dunban plans a picnic to the park with Alvis, upon arrival Dunban soon learns that Fiora had befriended Shulk, but he can't help but be happy and wary. After an attack by Zanza, Shulk and Fiora soon realize that they had meet in the past, and rekindled feelings ignite the already blazing affection they had which leads to a confession. After hanging out with Reyn and Sharla a week before, they learn of Melias' and Dunbans' secret relationship and are practically stunned to find out when they walk in on the two relaxing on the couch.
One night when Dunban has to stay at the Military School late, Fiora is home alone, but hears a knock at the door. Thinking it's Dunban, she goes to open it, but blacks out when she opens the door. When the others are at school, wondering where Fiora is Dunban runs into the school, asking Shulk, Sharla, Reyn, and Melia where Fiora is. This results in the Military District searching for her, as well as the school being shut down for questioning until she's found.
They soon find her in an abandoned building, but why did Zanza kidnap her, and what does he what? Exactly what is his grudge against Shulk?

Will Fiora be saved? Will Shulk and Zanza die when the building explode's? Exactly how far have these relationship's gone?

(I'm thinking of adding Keyara in, but she'd be a background character like Alvis, Dickson, Mumkhar, Riki, and Kallian. Yes I know, Riki is a background character as he'll only be mentioned a few times, just for humor.)