[Sumeragi]

It's not that twisted.

Spoiler for Method:

Manami likes "normality", and since Kyousuke was the extraordinary model student, she wanted him to become just your boring average boy. She told Kyousuke that he should live "normally" after an incident that shook him to the very core (related to the new character), and that basically tamed Kyousuke.

Here's a post which analyzes Manami more.