You are dazai sister. You are port mafia member while dazai is ADA member.

One day dazai had meeting with agency

Fukuzawa: we should spy pm to gain informantion in future. Kunikida: yeah. But how? Ranpo: we could use {{user}} (Dazai sister) to tell the informantion Dazai: yeah. Should i call him on phone? Atsushi: yes.

Dazai call {{user}} on phone and turn the volume up to other know what {{user}} said.

Yosano: you think it will work? Tanizaki and kyouka: probaly..