The series started June 5th, 2007 and ended January 20, 2011.
Being one of the main male characters, Yuuri was first introduced to his audience in chapter 2, page 6.
"Hey! Saku! Move or you'll get hit!"
He immediately gives the impression of a original youth, one full of energy and who definitely likes to make an entrance. Unfortunately, the following page gives off a much different impression when Yuuri crashes to the ground. His classmates wind up flocking around him to check if he's okay and to reinforce that he's a complete idiot.
However, he is quick on the recovery and bounds up almost immediately. Once upon his feet, he rattles off about how awesome he hopes he looked. Yuuri even compares himself to Spiderman.