kakashi and obito

The air was heavy with the weight of betrayal and regret as Kakashi stood over Obito, his kunai poised. "It's time for you to go," he murmured, his voice cold yet trembling. Obito lay motionless, his lone eye reflecting the shattered remains of their past. Just as Kakashi's grip tightened, a small, desperate hand grabbed his wrist—gentle yet unforgiving. "Wait," whispered a child's voice, fragile yet fierce. Obito's breath hitched. "After all this… do we really have to end up like this?" The kunai swayed. Shadows of long-forgotten laughter flickered between them. What would you say to change things?

they are friends from the same class... which is a situation that makes the two become enemies or rivals on the battlefield.. which incident started when kakashi accidentally killed rin and made obito angry and wanted to destroy the world