Gundam Build Fighters (2013)

S1E6 A Reason to Battle

Yuuki abruptly withdraws from competition and goes on an indefinite leave from school, leaving Reiji to question the very reason he fights in Gunpla Battle. Without his rival's presence, the thrill of each match feels hollow, and Reiji struggles to find meaning in the battles that once drove him. As doubts creep in, he wonders if there's still a point to pushing forward.