I read this manga a while ago. All I remember about it was towards the end a girl gets kidnapped and the guy who kidnapped her ties her to a chair which is attached to the door (Its very complicated). But the main part is if someone opens the door her finger will pull a trigger of a gun on a person and shoot the person who is coming in. They did this because her "lover" is trying to find her and the guy who kidnapped her knows he will come so he did all of that. So I was wondering if any of you know this manga? Please help me find it, its driving me crazy! Thank you.