Disclaimer: I do not own Durarara!
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Izaya despised Vorona. He absolutely did not like her. Which was surprising, since he did say he "loves" all humanity. He does, in fact, but not Vorona.

He hated how she touched Shizuo. He hated how she got gifts from Shizuo. He hated how she was loved by Shizuo. He hated it. He HATED it.

The fact that Vorona and Shizuo are couples disgusts him. Why can't he have Shizuo? Why isn't he the one in Vorona's place? Why? Why? Why?

Well, he did in fact, date Shizuo. But when the ex-bartender met the beautiful Russian, it all happened in a snap. They broke up.
How unbelievable it was to the raven.

'What did Shizuo see in Vorona? She's just an emotionless blonde. An assassin too. Is it her looks? Her personality? What is it?!'

Ah, the informant thought and thought. He thought by himself, as he looked on the actions of the young couple. Was it stalking? No, no. It was just investigating. Yes, it is not stalking. Not at all.
Whenever Namie went home, he immediately opened his files on his computer to do his daily research. Shizuo and Vorona's latest trip, location, everything. He needed to know. Anything, for him to find out what Shizuo liked in Vorona. But, he didn't find anything. Nothing. So he came up with the solution.

Perhaps it wasn't her looks or personality, but the soul itself.

Now, how would you get rid of a soul? There isn't a way. But there's a way on how to send a soul somewhere else. What is it?
The answer...
Killing.