The 16-year-old boy shot dead at a Queens bus stop Wednesday stumbled across the street to a bodega where he collapsed, heartbreaking new video shows – as his tearful dad came forward to plead for justice. 

Sincere Jazmin was blasted in the chest during a fight with a rival – which investigators believe may have stemmed from an ongoing school feud – soon after hopping off a Q83 bus on Liberty Avenue near 172nd Street in Jamaica around 2:40 p.m. Wednesday, cops said. 

“Sincere was a good kid – good, good kid,” Sincere’s father, Terrell Kanston, told The Post Thursday morning as he visited the C.Y. Deli Grocery across the street, where his son collapsed. “All he wanted to do was show love to everybody. It’s just sad, bro.”

“They gonna reap what they sow, you know,” Kanston said, referring to the killer. “I want justice, yes.”

Footage obtained by The Post from inside the store shows the moment the injured backpack-wearing high schooler, who apparently stumbled across the street after he was shot, sits down on a step in front of the corner store.

Several seconds pass, with the ailing teen — who is seen from behind — raising no alarm for passersby outside the bodega. 

Then Sincere collapses in the doorway to the store, catching the eye of a beer deliveryman who had just left moments before the teen arrived.

“My [delivery man] told me the boy was out there,” store manager Kenny Patel, who remained behind the counter during the heartwrenching scene, told The Post Thursday morning. “He was holding his chest. He asked him twice, ‘What happened? What happened?’ He didn’t answer. ”

The video shows the gravely injured boy trying in vain to sit up, before collapsing once again, sprawled out as the worker appears to check under his shirt for signs of a wound. 

“He was holding his chest,” Patel added, noting that the teen was not bleeding. “The door was opened and he fell halfway inside.”

“He tried to get up but he couldn’t,” the manager said. “His eyes were closed. My [delivery worker] called 911.”

Soon another man and a woman, who appear to have been customers, join the huddle around Sincere. 

Several cops then arrive on the scene and tend to the unconscious teen. 

Sincere was rushed by medics to Jamaica Hospital Medical Center, where he could not be saved. 

The boy’s grieving dad stopped into the deli Thursday morning, where he shook Patel’s hand.

“I’m his father. Thank you,” Kanston said, as tears rolled down his cheeks. 

“I’m sorry,” Patel replied.

Kanston said his slain son, who attended John Bowne High School in Flushing, “just wanted to be the best, you know.”

“I have a daughter, too, but he was older. The whole family is hurting.”

Kanston then stood outside the store and looked across the street toward the bus stop where the deadly violence broke out, before getting in his car, sitting inside for a while and driving away. 

“I just came to see where it happened. I’m hurting. I don’t have words right now,” said Kanston as he wiped away his tears.

People gathered at Sincere’s home less than a mile away requested privacy Thursday afternoon.

“Oh God!” a female voice could be heard crying inside.

No arrests had been made in connection with the fatal shooting by Thursday afternoon, as the NYPD released footage of the suspect walking on the sidewalk after the deadly violence. 

The backpack-wearing suspect, with a slim build and a dark complexion, was last spotted wearing a green hooded sweatshirt, gray sweatpants and multi-colored sneakers.

Additional reporting by Steven Vago