The anime episode 75.5 adapts material from the epilogue chapters found in the Kuroko no Basket: Extra Game manga.
While the Seirin team plans a surprise party for Kuroko, the members of the Generation of Miracles (Kise, Midorima, Aomine, Murasakibara, and Akashi) decide to reunite for a game of street basketball to celebrate their former teammate's birthday. kuroko no basket 755
Suddenly, the gym doors slide open with a bang. Silence falls. Standing there are the Generation of Miracles—all grown up. The anime episode 75