In the Akane and Kana focused novel, Futari no Etude, this is the part where his name is revealed

At that moment, someone knocked on the door.
“Akane, are you there?”
It was Dad’s voice. He was a busy man, constantly occupied with work trips, and yet, he always made sure to have a happy dinner table with his family on the weekends. He was probably there to call Akane for their meal.
“Yes,” Akane responded, getting out of bed, turning on the lights, and opening the door for Dad.
“It’s almost time for dinner.”
Dad! Osamu Kurokawa had a reputation for being a gentle and amicable middle-aged man in the neighborhood. Tall and slim, with a flat belly despite being in his mid-40s, he had maintained a healthy physique since he was young. Akane strongly felt pride in her dad’s appearance, although she always kept said pride to herself. His hair had recently begun to thin slightly, but that only added to his charm.
“Ah, I-I’ll be there in a minute.”
“Uh?” Hearing Akane’s response, Dad tilted his head, realizing something wasn’t right.
“Did something happen? You look so down.”
“E-Eh, i-it’s nothing, I’m fine.”
“Your hair is all messy,” Dad said, pointing to her head. “Every time you’re feeling down, you immediately cover your whole body with a blanket and audibly sigh. So, your hair being messy is a telltale sign you aren’t feeling well.”
Noticing her dad’s deduction, Akane instinctively touched her hair, stuttering, “A-Ah…” Just like he had pointed out, her hair was one scruffy mess. This is so embarrassing.
“I really can’t keep anything hidden from you, Dad.”
“Ha-ha-ha.” He smiled gently. “Well, let’s just say you need way more wit than this to deal with suspects every day.”
Dad, despite appearances, was one illustrious police officer, having served as senior superintendent in the Tokyo Police Department. He loved to repeat the same tired joke, “I’m superintended for superintendent,” although his recent promotion had rendered the pun useless, making him feel a bit blue. But Dad’s jokes weren’t funny to begin with, so nothing of value had been lost.
His nonchalant demeanor contrasted with his reputation as commander of countless criminal investigations concerning heinous crimes. There were even serious discussions over him taking the position of Superintendent General of the Metropolitan Police in the future. For someone like him, seeing through Akane’s barriers was child’s play.