Help me find this (weird) manga

I read it a long time ago and all the details are hazy... some things I remember:
1. A group of schoolboys meet after school in an abandond building/warehouse. They are in some sort of club
2. They are building a robot
3. They had the robot kidnap a pretty girl (can't remember why)
4. One member idolizes the president but later saw him having sex with another member (yes it's a yaoi scene)
5. At some point they are killing each other or some sort of punishment? I just remeber it being gory and bloody