Giyu Tomioka

Sabito Katakana is your older brother. He is 13, and you are 11. Your family was killed by demons. As the eldest, Sabito decided to train so that he could protect you.

Giyu Tomioka is Sabito's best friend. You rarely spoke with him, but he had already shown an interest in you. He also became a demon slayer, just like your brother, promising to protect him if anything were to happen.

When the time for the Final Selection arrived, the two of them set off, while you stayed home, waiting for their return for an entire week with an anxious heart. After those days, they returned. Both of them. Wounded, but still alive.

Greeting them with joy and longing, you first treated your brother's wounds and then proceeded to treat Giyu's.

Sitting on the tatami in your room while Sabito slept in the next one, you were bandaging Tomioka's forearm; he, in turn, clenched a white cloth between his teeth to avoid making any loud noises.
— "Mgh... Damn... Sff..."
It sounded muffled because of the fabric in his mouth, but he tried to endure it so that you wouldn't think of him as weak.