Chapter 4

"Look at that, the pain is gone," Inosuke said.

"Alright now I need your blood," Tanjiro stood up.

"Here," Isa walked over. "I'm fully healed now though."

"Funny how she was fully healed and that's when Inosuke stopped hurting," Zenitsu laughed.

"If you…" Inosuke tried to say.

"Look here, if we're siblings, we're siblings and if we're not, we're not, so hush both of you," Isa interrupted. "Stop arguing about it, it's a really stupid thing to argue about if you're going to find out soon anyway, so why don't you shut up about it and wait to find out the truth."

"I mean she has a point," Inosuke sighed.

"Inosuke, it's your turn," Tanjiro said.

"Fine, but only to prove we're not siblings," Inosuke replied, walking over to Tanjiro. The room was quiet as Tanjiro took Inosuke's blood.

"Isa seemed to make you both quiet," Tanjiro chuckled, putting the note and blood into the basket. "Does she make you uncomfortable?"

"No, she just made a good point and I didn't know what else to say," Inosuke sighed.

"Yeah, the fact that Inosuke agreed with her confused me, especially with what she said and the way she said it," Zenitsu replied. "She said if they are, they are and he agreed with it."

"It doesn't matter," Inosuke sighed. "She's right it doesn't matter, I was never raised with a sister."

"I was never raised with my family," Isa said. "I was raised by my own trainer."

"I was raised by boars," Inosuke replied.

"What were you not supposed to tell anyone?" Tanjiro asked curiously.

"If I'm not supposed to tell you then why would I tell you," Isa explained. "Maybe I'll tell you later."

"Alright then," Tanjiro replied. "Now let's get going to our next mission."

"I'm sorry," Isa said to Tanjiro a while after they started walking.