I haven’t read it in a few months but I’ve generally kept up with the manga for the last four years. It’s mostly interesting in a meta way, where you see how long they can keep up the stupid premise.

There was an author interview that was translated and included in one chapter of the manga where the author revealed that although he had planned all 100 girlfriends from the beginning, some of the prospective characters had already started to overlap with existing ones and will have to be reworked. Is it really possible to write 100 good unique characters?

Practically, no. I think the manga falls off really hard after the 23rd girlfriend (currently it’s at #36).
I’m hoping that the 100th girlfriend is a girl who already has 99 boyfriends and I’m like 95% convinced that doing anything else would be sexism.