Secret behind her | oc(reader) in the bsd universe

Yun(reader) is a detective that acts pretty playful and normal but deep down she is pretty nihilistic and frequently tries killing herself. She also doesn't seem to trust humans.But why? well,that's a secret that she has been keeping to herself. Her first encounter with dazai was in a bar when he was still in the Mafia,both seemed to have some similar perspective on life. Will they maybe convince themselves to keep on living or would they end up in a grave?