KUUGA (Detective Conan x Male reader)

Intrigue surrounds Kuuga Yusuke, a young boy with a shadowy past who was trained as a swordsman and assassin by his mysterious master. He had no name of his own.

However, it was his adoptive father, Owner Akio Sawyer, who bestowed upon him the name Kuuga Yusuke. Kuuga took APTX 4869 for his own reasons, unaware that it would turn him into a child. Now, Kuuga doesn't know why he exists and seeks to find his reason to live.