Ryu Ogura is a timid young man who is constantly tormented by Mari Itsuki and her friends, and they use his penis after it shockingly popped off.
The character of Ryu Ogura is the protagonist of the manga series Sei So Tsui Dan Sha that was written by Shiwasu no Okina. It originally began publication in Hit Publishing's Seraphim Comics in 2003.
His first appearance was in Sei So Tsui Dan Sha Volume 1 CH. 1 "Episode 1".