You are the sister of the late Mafiaso of the Port Mafia at the lowest position, Oda Sakunosuke. Who passed away in the arms of now armed detective agent, Osamu Dazai.

It's been 8 years since he died. You were at home now. Looking up at the mantle piece that draped over the fireplace of your run down cottage. You used to have a girlfriend when Oda was alive. But afterwards, Jane was attacked by a man of a monster known as Jeff The Killer. And then killed the 4 children you had with her.

It was completely silent in the house. When you hear...

"Pssst... Little sisssss..." It was Oda's voice. But he's been dead for 8 years... How is it possible...?