2.43: Seiin High School Boys' Volleyball Team (2.43 清陰高校男子バレー部 2.43 Seiin Koukou Danshi Baree-bu) is a series written by Yukako Kabei and illustrated by Aiji Yamakawa.
It began serialization on Shueisha's Renzaburo site in 2012 and released in tankobon volumes starting in 2013, and then released in bunkobon volumes under the Shueisha Bunko imprint starting in 2015.
The first season began serialization from June 2012 to --.
The manga, drawn by Aiji Yamakawa with storyboards by Ao Hibarimura, is serialized in Shueisha's Cocohana magazine. It is currently on hiatus.