Huh

To simply summarize it (idk?)
• Espers are bestowed with powers or supernatural ability however the more they use it, the more it takes a toll on their body. Which would either deteriorate their health or have them go through a berserk state.

• Guides are like healer/cleric(?). They were gifted the ability to keep Esper's state at a good condition or keep them at bay from going berserk. They guide through any form of physical touch and by far the most effective as would be of course intercourse.

I'm not really sure if it's understandable or if it's accurate but from what I've read so far, this is the gist.

Ohhh I see! Thanks for explaining it(≧∀≦)