"We can't get married... Hm?" Shinobu Kocho jerked her head toward Tetsu no Sosuke, her expression darkening. "Don't try to trick me!"
Tetsu no Sosuke's face darkened too, even more than hers. "That bastard doesn't intend to take responsibility for you?"
"...What responsibility? Nothing even happened!"
Shinobu Kocho reacted even more fiercely than he had. "Anyway, you're not allowed to meddle in this."
"Come on, I'm your brother-in-law. How can I not meddle?" Tetsu no Sosuke grew angrier. "You're dating someone, and your sister and I haven't interfered. We're even happy about it! But if you're dating, you have to be responsible to yourself, to the other person, and to both your families. You might think it's just between the two of you, but it involves two families. We won't take advantage of anyone, but we won't let anyone take advantage of us either. Especially not someone who takes advantage of you and then refuses to take responsibility! I'm telling you, if you hadn't said anything, that would be one thing. But now that you have, if I don't investigate this until I know exactly what's going on, I'm no Hammer Pillar!"
"That's right, you're the Iron Pillar!"
Shinobu Kocho wasn't afraid of him at all. "Go ahead and investigate if you can! Turn the entire Demon Slayer Corps upside down. Let's see if you can find him!"
"So he isn't in the Demon Slayer Corps?" Tetsu no Sosuke was good at picking clues out of what others said, and he immediately caught that one. "You're seeing an ordinary person? That's good too. You'd probably have a more peaceful life in the future. But why can't you get married? Does he already have a family? Is it something else? Do you not want to marry him? Then why are you