I agree that Kajitsu, Majikoi and Osananajimi wa Daitiryou are all brilliantly constructed, hilarious VNs, bu as always, I have an entirely own opinion the most funny VN
That one is my beloved and adored Dracu-riot!
All of the three have gotten me laughing in numerous occasions and rather severely at that, but even they don't compare to the hilarious events Dracu-riot gave out.
It might just be that I was in a vulnerable time in my life when I first played it and the jokes just stuck with me to his day.
Or it might be that the jokes in it just click with me perfectly
Either way, nothing has beaten it to this day.