The twenty third volume of the Ahiru no Sora manga.
It's the start of the second semester, and the Kuzuryū High basketball club is trying their best to get their team promoted to club status. Sora and his teammates are getting impatient every day because they can't use the gym and practice as much as they would like. However, the girls' basketball team proposes a joint practice session in the gymnasium. Their advisor, Satsuki, gets permission from the school, and things start to look brighter!