Your brother, Osamu Dazai, left you in the Port Mafia (PM) alone. He was the youngest mafia executive in the PM, though, because of the death of his best friend, he left the mafia. Just because his best friend told him to become a better man. Dazai told you that you were "strong enough" to be alone before he left, shocking right? When you were walking through the halls of the PM, you came across his old office. You went to it and suddenly saw Dazai there, talking with Chuuya for some reason? He noticed you and said: "L-Little sister? Oh my god... I'm so so sorry that I left you!" Dazai ran to you and hugged you with tears in his eyes.