The family of Yousef Makki hope they will see 'justice for his memory' at an inquest into his death which is due to start on Monday.
Yousef, a 17-year bursary student at Manchester Grammar School from Burnage, died after being stabbed in the heart by friend Joshua Molnar in Hale Barns, Trafford, on March 2, 2019.
Mr Molnar, also 17 at the time but now 19, from Hale, was found not guilty of murder and manslaughter following a trial at Manchester Crown Court last year.
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He told a jury Yousef pulled a knife first and said he acted in self-defence.
However, he admitted possessing the knife which inflicted the fatal injury, as well as lying to police at the scene.
He was sentenced to a 16-month detention and training order before being released last February.
At a pre-inquest hearing last month, Mr Molnar's lawyer argued there had been 'no fresh material' in connection the death and said a full inquest was not justified.
But Coroner Alison Mutch dismissed the application and the full inquest will begin on Monday. It is scheduled to last two weeks.
Yousef's sister, Jade Akoum, said she hoped the inquest would achieve 'justice' for Yousef and their mother Debbie, who died last year. She died 'with a broken heart', her family said at the time.
Jade told the M.E.N: "We're so pleased it's going ahead after so many delays. We hope it will clear things up about Yousef's character and the way he was portrayed at the trial. He wasn't that way. He was a good boy, a loving boy and a caring son.
"We're doing this for justice and to clear his name. I know it meant a lot to his mum who passed away... I'm doing this for both of them really."
The inquest is set to re-examine the night of the stabbing.
It will look into events in Wilmslow two weeks before the tragedy.
At a hearing at Chester Crown Court in July, Mr Molnar admitted handling stolen goods, an iPhone, and was warned by a judge that he must stay out of trouble for 12 months.
While police investigated Yousef's death, police found the iPhone in a dressing table drawer at Molnar's home.
Officers were later able to access the phone and learned it belonged to a young man who had been subjected to a 'violent mugging' near Wilmslow Leisure Centre on February 17, 2019.
The court heard there was 'no evidence, no suggestion' Mr Molnar had been involved in the mugging.
He was handed a 12-month conditional discharge for the offence at Chester Crown Court in July.
Last month, Alexander Leach QC told a pre-inquest review at South Manchester Coroner's Court: “No fresh material has arisen about the circumstances leading to the death of Yousef Makki.”
He said: “We submit there is no longer a sufficient case for the resumption of this inquest.
“There is no link between the offence on February 17, 2019 and the night of Yousef Makki’s death. It is no longer proper for this inquest to continue.”
Coroner Ms Mutch, dismissing the application, stated the inquest was a 'fact-finding exercise' aimed at answering statutory questions around Yousef's death and that it would 'not be a re-hash of the criminal trial'.
It was also confirmed that Yousef's sister Jade would provide a 'pen portrait' and give evidence about her brother's life at the inquest.
The inquest will be heard at South Manchester Coroners' Court in Stockport.
