Thinking about the idea that Dazai is allergic to most strong pain medication—morphine, opioids, heavy sedatives… and how much that quietly explains.
And not in a mild way either. I’m talking—
✶ nausea so violent it’s worse than the injury itself
✶ heart rate that won’t stabilise
✶ breathing that goes shallow in the wrong way
✶ dissociation that isn’t the kind he chooses
✶ or even his ability interfering in ways no one can reliably predict
Because here’s the thing—Dazai gets injured. A lot.
Gunshots. Stabbings. Whatever the hell he’s doing off-screen.
And we know, canonically, he hates pain. He avoids it. Even his suicide attempts lean toward methods that minimise suffering. And yet—we almost never see him react to pain like a normal person. We never see him reach for anything to dull it.
So I keep coming back to this: what if he simply can’t?
The first time it happens it doesn’t look like a pattern—just a bad reaction.
Dazai goes too still. Too pale. A pulse that stutters where it shouldn’t. Breathing that makes even trained medics hesitate.
So they adjust. Different drug. Smaller dose.
Worse.
By the third time, it stops being coincidence.
And somewhere, in neat clinical handwriting, it gets recorded:
—adverse response to opioid analgesics. avoid where possible.
And Dazai learns that reality long before he ever sees it written down.
Pain, he can work with. Pain can be measured. Observed. Endured. Filed away.
Pain is predictable.
Medication isn’t.
Medication is loss of control. A variable he can’t account for. A risk where the outcome isn’t relief—but absence. His body slipping out from under him in ways he can’t interrupt once it starts.
So he stops taking it.
And that’s where it shifts.
Because this isn’t just about medication.
It’s about limitation.
Dazai doesn’t just dislike pain.
He learns, very early on, that pain is something he cannot safely escape.
Other people get injured, and there’s an end point. Relief. Sedation. Something to take the edge off. A guarantee—however small—that it will stop.
Dazai doesn’t have that. For him, every injury comes with a calculation:
endure it
or
risk something far worse than the injury itself
And once that becomes your baseline—of course you hate pain. Not just because it hurts. But because it traps you there.
And Mori would be the first to recognise that—of course he would.
The absence of requests. The way Dazai goes still instead of tense. The way he endures rather than bargains.
Most people ask for relief.
Dazai… adapts.
But he doesn’t correct that. If anything—he refines it.
Nothing obvious. Nothing that could be called cruelty. Just efficiency. Bandages applied neatly. Wounds cleaned without pause. Stitches taken as if the question of pain never needed asking in the first place.
And Dazai learns what’s expected of him.
Not through orders—Mori rarely needs those.
Through pattern.
If he doesn’t ask, the process is faster.
If he doesn’t react, it’s cleaner.
If he makes it easy, it becomes routine.
So he does.
He talks through it. Jokes. Distracts. Turns it into something almost entertaining—just enough that no one lingers on what’s missing. Just enough that it looks like a choice.
Because that’s safer, isn’t it?
Safer than admitting there’s something he can’t afford to risk.
By the time he leaves the Port Mafia, it isn’t even a decision anymore. It’s just how he functions.
He's loud about small pain.
He complains.
He makes a spectacle of it.
...And that’s exactly why no one looks for what’s missing underneath it.
Dazai still hates pain—just not in the way people think.
Not just because it hurts—but because, unlike everyone else in the room, he doesn’t have a safe way out of it.
For him, it’s never been pain or relief.
It’s pain… or the very real possibility of not waking up at all.
Which means even his so-called “easy way out” was never actually easy.
And that’s the part that changes everything.