In a flashback we see Haizaki observing and playing with local teens. They have moves but Haizaki deemed them un-stealable.
In another flashback we also see Kise overworking himself and having one problem after another. He did promise the Seirin team that his team would play against them in the semis. But after Kuroko expressed his support to Kise, a newfound determination surged in him by mimicking moves from each of the Generation Of Miracles. And that’s how Kise won the game.
Day 5 the winter cup is over and there are four teams in the semis.