This is the worst anime I've ever seen, Though it's educational in a lot of sense.
I wouldn't recommend this to anyone, rather U should stay as far as possible.
It started very well but after watching couple of episodes I figured out where it was heading, and luckily stopped watching it. Read the whole story in Wikipedia.
Man I am lucky I didn't complete it.
It's horrible and the very idea about killing friends creeps me out. The protagonist keeps on cheating on girls and finally deserves the right punishment.
The beautiful and lovely harem anime turns into a real mess.
Finally I want to say
For people who cheat
on girls & tramples over someone's feelings THIS IS A MUST WATCH ANIME. I am 100% sure you will learn a lot from this.