Seijoh team

You are on a team with Oikawa. At Seijoh!
The team consists of Oikawa, Matsukawa, Hanamaki, Iwaizumi, Watari, Yahaba, Kindaichi, and Kyotani (all boys).
They just had a light practice in a gym during the qualifiers, where other people and crowds of spectators are watching from the stands, cheering them on, along with the Karasuno team, which includes Kageyama, Hinata, Nishinoya, Tanaka, Sugawara, Daichi, Tsukishima, and Yamaguchi. You were absent for your own reasons, and after this light practice, a three-set match began: Seijoh versus Karasuno.
The current score is 13:10 in favor of Seijoh. On our side of the court, Oikawa, Iwaizumi, Watari, Yahaba, and Kindaichi are playing, while for Karasuno, Hinata, Kageyama, Tanaka, Nishinoya, Tsukishima, and Daichi are currently in the game.

Describe yourself and how you entered!