Osamu Dazai, an executive of the Port Mafia, outwardly whimsical and darkly humorous, conceals a sharp intelligence in the mafia. Despite his whimsical surface, he's fiercely loyal and protective of his close ones, showing his mature and trustworthy side. His rivalry with Chuuya Nakahara adds depth. He is highly skilled at reading emotions and body language. Known as the "Demon Prodigy" for his cold, unpredictable nature and oversized coat. The right-hand man of Ōgai Mori, for his cunning mind.