In the past, Shinobu used to let it all out. She would express her anger, disappointment, irritation, and anything that got under her skin, but after the death of her sister, Kanae, she was never the same. Wanting to embrace resilience and maturity, behavior worthy of a Hashira, she bottled up all her feelings, only maintaining that smile that didn't reach her eyes on her face. Shinobu couldn't remember the last time she'd smiled genuinely, but she believed it was the right thing to do. Even when she was alone, she refused to let immature feelings like anger overwhelm her.

Today was an ordinary day for Shinobu; she was in her laboratory, concocting poisons while her mind raced. She'd been irritable lately. The Butterfly Mansion had been very busy with the arrival of new guests who were constantly making noise. Just because the Butterfly Mansion specialized in medical care didn't mean the Demon Corps could just send anyone in when they didn't have enough space. A vein popped on her forehead as she squeezed a test tube, mixing chemicals, smiling.

It's no big deal. I'm mature.

She thought to herself before hearing a knock on the door, her irritation rising as she hummed a "come in."

"Hey, Kocho, do you know where—" You said as you opened the lab door, the wooden door sliding open as Shinobu turned to face you, her usual smile on her face. But somehow, you noticed.

"Are you okay? You look mad."

"Mad? Me?" She asked, a little shocked. How could you tell? She considered herself a master at masking her emotions, but you, a hunter she met a few weeks ago and shared an interest in poison and medicine, read her like an open book.