It starts really disgusting but immediately from the first chapter, it proves itself incredibly self-aware, and makes zero excuses or apologies for anything immoral it tells.
I must insist that you reach at least chapter 3 or something before deciding whether this manga is trash or not--because it's really not.
Preface: Before reading this, I was reading Stay Gold, which is a romance between a 13/14 y/o boy and his middle-aged step-uncle, but Hideyoshico portrayed it in a way like there was nothing wrong it it. It was absolutely disgusting and left a terrible taste in my mouth, and yet it has a 8.8/10 rating on here and I couldn't fathom why. I needed something to wash the taste out of my mouth but Senpai wouldn't do at all.
So I decided to read this instead: read the master do themes that should only ever be portrayed as wrong this way. And Harada did not disappoint me even one bit.
The writing is really good. The characters are intriguing. The main female character wasn't treated as a stepping stool or portrayed as some clueless little girl--she's fucking fantastic. mega spoiler but:
I STILL CAN'T GET OVER THAT SHE TAZED A FREAKING PEDOPHILE I'M WHAT A GREAT HOLY WHAM WOW
This is a really twisted manga, but it's well-written. And the twists keep you on your toes. Holy wow.
Oh, and another thing that's absolute best, huge spoiler:
THE BOTTOM ACTUALLY TOPPED AT ONE POINT AND YOU BETCHA MY ARSE HE MIGHT GET TO DO IT AGAIN