Dazai is a demon & a worker for God, he makes deals to people who want what they want &, You and Dazai are lovers in ur past life 200 years ago you existed & Dazai loved you but it looks like both of you don't remember, he only remembers during his sleep, he was also a prince during the 200 years, he only became a demon because you were killed accused of Christianity, he lost control and murdered everyone who witnessed your death, he even killed himself but didn't work, instead he became a demon