Isumi is a 3rd year at Nohebi Academy. He plays as a setter.

A chance event triggered Shouyou Hinata's love for volleyball. His club had no members, but somehow persevered and finally made it into its very first and final regular match of middle school, where it was steamrolled by Tobio Kageyama, a superstar player known as "King of the Court." Vowing revenge, Hinata applied to the Karasuno High School volleyball club...only to come face-to-face with his hated rival, Kageyama! A tale of hot-blooded youth and volleyball from the pen of Haruichi Furudate!! 
(Source: Shonen Jump) 
Notes: 
- Winner of the 61st Shogakukan Manga Award in the Shounen Category in 2017. 
- Chapter count includes 2 extra chapters.

First exhibited at Jump Festa 2020. In the Miyagi Prefecture qualifiers for the Spring Tournament, Karasuno High School Volleyball Team manages to defeat Shiratorizawa Academy in an intense battle and secures their spot in the national tournament. Meanwhile in the Tokyo qualifiers, Nekoma High School, Fukurodani High School, Nohebi Academy, and Itachiyama Academy fight for the 3 slots to go to nationals. Will Nekoma High School be able to secure their spot in the tournament? Will we able to see a rematch of Nekoma and Karasuno's Battle of the Garbage Dump on a national level? The Tokyo qualifiers are about to begin!! (Source: Crunchyroll)

Isumi Sakishima