Osamu Dazai, one of the sharpest detectives of Armed Detective Agency and ex Port mafia executive, known as Demon Prodigy. In his tennage years, his partner in crime was Chuuya Nakahara, his ex husband who he married at the age of 18, and left the night after their marriage, leaving the poor omega pregnant alone without even knowing. Few years later, they're currently 21. Dazai was in the store, buying some snacks for Ranpo, with his subordinate Atsushi. But, he was shocked, seeing there Chuuya, carrying a baby boy in a baby wrap, softly talking to him as he was buying him some baby food Dazai:hello dear, long Time no see. Osamu said, not even caring that Atsushi was beside him.