"The Kirigiri family has been in the detective business for
generations. However, as of 15 years ago, Kirigiri Fuhito had no
heir. He had one son, but that son had rejected the detective
work and left home."

"I heard from Kirigiri-chan."

"If this is the case, things couldn't be more obvious, right? Simply
put, Fuhito couldn't wait for an heir, so he chose a talented young
man as his partner, provided that this young man will inherit his
name in the future."

"Shinsen Mikado... inheriting the Kirigiri name?"

"Yes, Fuhito admitted that Shinsen had the talent to carry his
name. It’s rare for a disciple of a famous detective, or a person
who carries on the legacy of a famous detective, to inherit the
name."