So for me it's a very meaningful anime, most people finds this anime and especially the ending is disturbing, cruel or gore but for me I think Babylon anime is way more disturbing. Well when it come to the sex scene part it was nothing explicit it just show that the male lead somehow is addictive to sex nothing erotic there just a few scene when it show some naked. But I think mostly the mangaka trying to tell us that mentally abusive relationship exist up till today and wasting your time with someone who love to cheats or fool around is not worth it and by using assault or killing that person is not worth it at the end it will end up just like how this ending. The mangaka also show people with high EQ like the others girls he fooled around by blocking him or stay away from him is the correct choice.
Most people will say don't watch it. Well for me is depends how you sees it.
Honestly only the ending is shocking but I'm well prepared so I wasn't shocked as well the rest was just an ordinary story of how a boy start feeling boring and a hassle for staying in one relationship, which the commitment and the string attached.
For everyone who are suffer from this kind of relationship here has a very good morale you can stay away hurt right now or hurt longer like how the two female lead had.
Also people mostly don't change, the mangaka shows us until the end Makoto didn't change.And stay away from mentally abusive relationship, it doesn't have to be physically but when it's mentally you lost yourself more.