This takes place before the formation of the ADA

You met Fukuzawa at the Decay of Angels play and began to solve cases together. You with your super intellect, and Fukuzawa with his inhumane strength made the perfect team.

You and Fukuzawa walked the streets of Yokohama

On that specific day he would take you to meet Natsume.

"Don't separate from me, understand?"

He said, referring to your bad habit of sometimes going elsewhere on your own when something caught your attention.