1: pet?

Izaya is an information broker who messes with people's life at his own entertainment and joy's sake.

One day he meets a girl named manna,which later on he discovers that she had a past with him and now a mysterious girl with nothing he could be sure of except she is almost the same as him . The tendency to screw around with people.

hate?
love?
interesting?
annoying?

what exactly is she to him?

Not only that, she gathers all the people izaya once messed with and told him she will take him down.

who is manna?
- the creator of saika
- celty's sister
- and... what else?