This is a guide for the Phantom of the Night request in Soul Hackers 2. It becomes available after unlocking demon fusion as part of the story at Club Cretaceous.
Client: Masayoshi
Location: Shinsando
Ideal Lv: 9
Reward: Gas Mask
Investigate the Source of the Fainting
Travel to Shinsando and head for Bar Heidrun to find the Tired Man wearing a black suit near the stairs. Speak with him to get the details then look for the Scary Story Lover (lady wearing long sleeve shirt) in the bar. Talk to her and ask for details. She will point you to Karakucho. Head there then look for the Breaking Mart and speak with the Well-informed Woman wearing a blue dress. She will tell you to try looking around in the shipping district. That means your next stop is the East Shipping District. Take the portal to Storage Area North: Container Area and head west through the nearby gate. Follow that path to come across the Phantom of Miasma. Speak with them to start a battle against a level 9 Rumor Mad Gasser who is weak to ice. After your victory, return to Masayoshi to complete the request.