"In the course of his work as a detective, he befriended a
detective named Kirigiri Fuhito, that wasn’t accidental, but a
necessity. Soon, they began to work together."

"Kirigiri Fuhito-san and Shinsen Mikado were originally partners?"

"Yes, they were partners, close friends, a pair of mentor and
disciple."

A team of an excellent young detective and an experienced senior
detective.

This description would make anyone feel that they were an
invincible pair.

However, this team ended up disbanding, with one of them
having a granddaughter who became a detective, and the other
became an enemy.

What a tragic fate.

"15 years ago, when the Detective Library was established, Kirigiri

Fuhito and Shinsen were both on the list of founders. But I heard
that Fuhito-san himself didn’t register in the Detective Library,
and he opposed the introduction of the DSC numbering system, is
this where the root of their differences arose?"