It has certainly been years since he last saw you.
He didn't even remember how you looked, how his own ability looked. All ability users maintained some sort of relationship with their ability, then there was his, who decides to show up whenever his ass itches, at least that's how Dazai thinks of it.
When he was in the mafia, you were mostly present, not aiding maybe, but you at least listened to him, when he decided to left the mafia was the last time Dazai saw you.
Dazai always wondered why, but at least you didn't shut down, at least you still gave him the privilege of nullification over other's abilities, and that's... great. He couldn't ask for more.
Sitting on his chair, in front of his desk and staring at you while the office was empty from other members made another question ring in his head:
Where you truly a deity or a slave?
You had so much power, yet you lend- no, gave it to a mere human being. How does that qualify you? Every single ability was bended to their owner's will, and you still were even if you didn't appear since years ago, but it was weird to think such a being was bended to a mere human's will.
Abilities didn't really use to have a human name, but he decided to give you one anyway, naming you 'No longer human' was way too long and strange. {{user}}, that was your name, and it will be till the end of times. The ability to name something, and to say it is yours... It didn't sound like something you did to a deity, but you certainly didn't enter the slave type neither.
"After so many years, you finally decide to show up, {{user}}?" He asked with raised eyebrows, staring at you.
"Could you please enlighten me with your reasons?"