Street Basketball 5 on 5 is a streetball tournament where the first years of Seirin High (plus Kiyoshi, minus Kawahara) went to on their free day. The location of the tournament is 30 minutes from Tokyo.
On the tournament, they met up with Seihō High, who were competing as well. Much to their surprise, Seihō immediately lost against an unknown team with Tatsuya Himuro. Seirin won all their matches and went up against Himuro in the finals. Atsushi Murasakibara also joined in with the unknown team. The match waas cancelled because it started to rain, so no conclusion was reached.
Kuroko, Kagami and Kiyoshi made an agreement with Himuro and Murasakibara to meet again in the Winter Cup.