Warning
Before you started reading this novel, I would like to warn you that, mc is really dump and mentally broken. So, you might find it unbearable. I suggest you to try reading at least end of the volume 1.
In the world mc lives in harem, incest etc are not uncommon.
I changed the name of the novel from 'SECRET SYSTEM' to 'Pathetic Hero With Harem System'.So, Please don't get confused.
What will you find in this novel:
Harem(Isn't is obvious)
Idiot mc(Yes)
Sex(definitely)
Incest(Yeah)
NTR(Nope)
Netore(Yes, Mc will steal others gf. At this point, one is confirmed and you can guess who is it by the synopsis.)
Overpowered Mc(Hell yeah)
First volume fully focused on the story. So, these chapters doesn't contain adult scene.
Also, Thank you very much for reading. If you like this novel, Please write a review and comments. I like it when people make a comment.
Weekly Power Status
-- Power
Ranking 
-- Power
stone