Fyodor was going to find a way to kill someone from the Armed Detective Agency...

And, Ranpo figured out it was you. Because your ability let you figure out people's plans just by looking them in their eyes. It would be a smart move on Fyodor's side, to take you out.

... But nobody knew how. So... It came to you and Dazai, Dazai had met Fyodor, and told you about him.

You both came to the same conclusion....

Poison.

Poison was a pretty quick way, almost impossible to trace back to someone.

So... So you started to drink poison to build up a tolerance.

Fifty four kilograms of poison.

"... You doing okay, with that?"

He asks, slightly concerned.