The Old Bailey has heard how a schoolboy from Leicester was stabbed to death after being ambushed when he got off a bus.
Yemurai Kanyangarara, who was 16, had originally left London for the East Midlands, but went back to sit an exam.
The court heard how youths on another bus spotted him and surrounded him with knives.
He bled to death.
It happened on a busy high street in July last year.
Three teenagers deny murder.
The trial continues.