I'm conflicted about this story. It's interesting because it's a bit more realistic, in so far as the way some issues keep cascading, impacting more and more lives and how any violence ends up skewing immature minds. Even people who weren't born yet when the first "incident" happened are still being affected by it.
What I didn't really like is that it's all somewhat excused as "being different", "having a trauma", "being in love".At one point I might have believed in that, but it's all too violent and real loving feelings can never lead to any type of violence.
I'm not sure I like the ending either. It feels to me like it's all going to go downhill and end up in a tragedy.

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:
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:

... Last updated on March 15th, 2017, 7:56am

I think the reviewer before me hit the nail on the head. This story is very realistic and very different from other shotas with how the characters are portrayed. In other shotacons the seme doesn't seem to as to be a true predator preying on innocent kids and more or less seem to love the child in their own sick and twisted way. Where as here this seme is a true predator. There is no way to get around it and it is clearly shown and whether or not he really loves the child is to be debated. Also the way the child is portrayed is very realistic and what I would imagine what some children actually go through when they experience something as tragic as this during a time in their lives where they are easily influenced. Therefore it is hard really to rate it but if you are looking for a more realistic shotacon then go for it.

This is one disturbing tale, like yes shotacon is generally a bit disturbing but when portrayed as hentai the seriousness of child abuse is generally brushed over. However it isn't really here, all of the characters are aware of how wrong it is and how traumatizing it is, yet the young boy and nii-chan still desire it. In a way the young boy is shown as purposely acting innocent to spur the nii-chan on... However knowing what something means does not necessarily mean you know what you're getting yourself into... Great art, messed up characters, messed up plot... That's Harada alright

It's like my mind wants to like it, because it's yaoi, but I can't get over how wrong it is. There are some shota where the boy clearly has a mature mind, it's like they put a normal grown character on a smaller chibi body. In those cases I might get over it if it's not just smut, cause it's really not my thing if not. The guy in this story is a predator, there is no way out of that, so as much as I wish for some sort of happy ending, that guy's personality won't allow it. I am curious about what type of disorder the guy has, or what whould the psychological classification for a person like him be.