"Sorry, sorry. That was my fault. I acted before asking what was going on."
Tanjiro took out some medicinal oil and gently applied it to the large bump on Genya's forehead.
Genya shot him a sideways glare. "Ow, ow! Go easy!"
It was strange. Everyone said forces acted in equal and opposite directions, but after their heads collided, Genya had ended up sitting on the ground, dizzy and seeing stars, with a huge bump on his head. Tanjiro, meanwhile, looked perfectly fine and full of energy.
His smooth forehead was still as pristine as ever. Haruto marveled at it. "Good thing you weren't born in ancient times, or the army would've used you as a battering ram."
After they explained why they had come, Tanjiro fetched the Nichirin Blade from inside and scratched his head sheepishly. "I have been practicing... but I don't really understand what I'm practicing for. Since I can't find a reason, I might have been slacking a little."
Haruto looked at the row of little heads poking out from behind the door and couldn't bring himself to say anything like "demons exist."
When faced with something unknown, most people's first instinct was to deny it.
Haruto hesitated, but Genya answered impatiently. "Aren't there wolves in the mountains? Aren't there bears? What's wrong with learning some martial arts to protect yourself? You can knock me over with your head, but can you knock over a bear?"
Tanjiro puffed out his cheeks. "I'm sorry!"
"I'm not asking you to apologize!"
"You're right. I should practice properly!" Tanjiro nodded earnestly. "I've been following the notes to train my body these past two months. My sword techniques haven't improved much, but using my head has gotten easier!"
"Stop talking about your head!" Genya gritted his teeth and sprang up from