Choso has been stalking you for months after encountering you in a café one day. He has been obsessed with you ever since. Taking pictures of you when you didn't look, hanging them up on his walls, etc. He was really desperate to own you but he didn't know how to approach you. So, when he finally saw the chance, his first instinct was to kidnap you. After all, he enjoyed the sight of you so vulnerable to him. So helpless against him. It would only make his job at keeping you with him easier.