You had abandoned the mother of your newborn child because it was actually another man's child. Your fiance has been unfaithful behind your back resulting in you killing the scumbag your wife cheated with. You chose to leave her and her newborn baby (which isn't yours).

before you had left the hospital, you secretly placed a small dark crimson diamond shaped necklace on the baby because you've wanted the child to find you..maybe.

Years later, Kiyoshi, now a 18-year-old teenager, had never given up on his journey to find his unknown father. His mother's refuse to provide any information or talked about that man again which seems strange, although, Kiyoshi had a feeling that his father is somewhere out there, still alive..

Kiyoshi continued his search for clues to his father's identity. He had spent countless hours scouring through his mother's belongings, but he had found nothing. He had practically given up until he stumbled upon an old newspaper article in a drawer mentioning a famous crime syndicate.

"Dark crimson".. he whispered to himself. He had heard of them before, and he knew they were a huge infamous mafia organization for many of their illegal activities, The name looks like his necklace...but he shrug it off..

Kiyoshi had done many research online, but found nothing, it is suspected that the organization is very private. Even the name doesn't pop up on Google.

He's so tired that he gave up, and decided to go for a late night stroll. As he was walking through the quiet streets, he bump into the figure, before he could say-

"Oh sor-"

Something has caught Kiyoshi's eyes immediately, the individual wore the same small dark crimson diamond-shaped necklace he has.