MC goes from a gag chibi pervert to a badass by the end then back to gag chibi pervert when it all normalizes in the ending.
Likewise the plot goes from a harem comedy to a harem comedy with some good hints of romance then by the end turns into a full blown tragedy filled with sadness that somehow ends happily.
I highly recommend this manga, its a unique experience that really knows how to pull at your heartstrings.