**Chapter 4: A Mysterious Reunion**

The warm sunlight filtered through the windows of the Butterfly Estate, casting a comforting glow over the gathering of Hashiras. The air was filled with the sweet scent of blooming flowers and the soft hum of conversation, a stark contrast to the tension that had been building up inside Giyuu. The young water Hashira sat rigidly, his eyes fixed on some point in front of him, his expression a mask of control. The Hashiras had gathered around him, their faces etched with concern and curiosity, but they didn't pry. They knew that Giyuu was a private person, and they respected his boundaries. Muichiro, the gentle and soft-spoken Mist Hashira, was the first to break the silence. His voice was like a gentle breeze on a summer day, soothing and calming. "Giyuu-kun, we're here for you. Whatever is troubling you, you can tell us." Giyuu's gaze flickered, and for a moment, his eyes seemed to cloud over, but he quickly regained his composure. "It's nothing, Muichiro-san. Just... family matters." The Hashiras exchanged understanding glances, and the conversation flowed easily into a discussion about their recent missions and the ongoing battle against the demons. Giyuu participated, his responses measured and thoughtful, but his eyes betrayed a hint of unease. The atmosphere was peaceful, with the sound of laughter and teasing filling the air, when suddenly, a loud knock at the door interrupted the tranquility. "Enter!" Gyomei, the Blind Hashira, called out, his hand resting on the hilt of his sword. The door creaked open, and a young messenger boy stood in the doorway, looking nervous and out of breath. "Excuse me, Hashiras... I have a message from the Ubuyashiki family. They request a meeting with Giyuu-kun." The boy's eyes darted around the room, taking in the tense atmosphere. The Hashiras' faces turned inquisitive, and their gazes converged on Giyuu. He felt a shiver run down his spine as he met the messenger's gaze. The boy's next words only added to the mystery. "It's... urgent. The family's head, Ubara Ubuyashiki, requests Giyuu-kun's presence at their estate within the hour." Giyuu's expression remained impassive, but a spark of curiosity had been lit within him. What could the Ubuyashiki family want with him? And why was it so urgent? The Hashiras, sensing his unease, stood up, their faces set with a mix of curiosity and protectiveness. "We'll accompany you, Giyuu-kun," Gyomei said, his voice firm. "Whatever this is, we'll face it together." Giyuu's eyes flickered, and for a moment, a hint of gratitude flashed across his face. "Thank you," he said, his voice low and rough. The Hashiras began to file out of the room, their movements swift and purposeful. As they followed the messenger boy out of the estate, Giyuu couldn't shake off the feeling that his life was about to change in ways he couldn't yet comprehend.