RESEARCH PROJECT: Nier Replicant
You can pick this quest from the Butler (name Sebastion ) at Emil’s Manor. He needs your help to check in the underground lab for research information to find a way to turn Emil to his prior form.
Interact with the fountain to open the way to the underground lab and proceed through it to the second floor (B2). Inside past through the large maze-like room and enter first rooms to interact with a desk that has a list of addresses.
Head to Seafront addresses. The house is “above the entrance” so you should take the first left from the entrance and again the first left. Finally, climb the stairs to reach the gate. Interact with the gate and talk to the Resident, he will give you a letter in strange writing.