I don't agree lmao
For the adoption part: you're talking like adopted people aren't part of the family just because they're not related by blood. Really disrespectful. They're brothers, it is incest
And then, why are you trying to justify a pedophile?? "He is attracted to Ren, period. Ren just happens to be a kid" but he's still a kid tho??? How does that change or justify the fact that he likes a minor? lmao
It's like saying: "yeah, he murdered a person, but it's okay because he only murdered one, he didn't want to murder that person, but it just happened". He's still a murderer period
And please don't say "if you don't like go away'' because people can have opinions on manga they don't like
Hello (=・ω・=) Yes, by the definition of the word incest you are right, even if its adoption it can be considered incest. However, by me putting "my opinion" as a disclaimer, it's my view - whether I consider it or not that way. In this case, I don't because they're not blood related and like I previously said, in Japan, same-sex couples adopt each other as alternative for marriage. I consider this fact, thus the reason why I don't agree this incest. If you think this is incest, okay then
About the pedo part, if you understood what I said I litetally agreed this is pedophilia because of the very fact that Ren is a minor. I can see where you misunderstood me tho. I don't quite agree on your analogy. It will work if we are talking about rape /anything criminal. I don't agree because pedophilia is more on a psychiatric disorder, it's on the mind and not an action, therefore pedophilia is not a crime and pedos are not criminals. It's not the same as murder/murderer.
If I am a going to make an analogy like yours, it would be more like "yeah, he likes a guy, but he's not really gay because he only likes one particular guy, he didn't want to like that person/he is not gay, but it just happened". In this case, you can't say the person is gay because he only likes one particular guy, he can be bisexual or something. DISCLAIMER: I'm not saying that being gay is a disorder, I'm saying it's on the mind.
The thing with Haru and Ren is pedophilia, period (like how being attracted to a same-sex is homosexuality), but I don't entirely see Haru as pedophile (ex. gay) since he is only attracted to Ren as a person. He is not attracted to Ren because Ren has physical attributes of a kid. (Like how you cannot say a person is a gay man when he is not attracted to men in the first place and he just fell for one special guy).
I hope by this you are able to understand my point. I hope this did not only confuse you lol. You don't have to agree, you can keep your opinion. Just want to clarify, I don't justify pedophilia, that's not my intention. I don't support it but in special cases like here, I can understand it. (Note that because this is fiction, that may have contributed a lot in my judgment. In no way I will defend rl acts of pedophilia). This got too long yikes, english is my second language long paragraphs happened to be the best way I can express my thoughts.
Hey, thank you for the reply, I wrote this yesterday night so maybe I read something wrong
"About the pedo part, if you understood what I said I litetally agreed this is pedophilia because of the very fact that Ren is a minor. I can see where you misunderstood me tho. I don't quite agree on your analogy. It will work if we are talking about rape /anything criminal. I don't agree because pedophilia is more on a psychiatric disorder, it's on the mind and not an action, therefore pedophilia is not a crime and pedos are not criminals. It's not the same as murder/murderer."--> here I didn't understand you said He's a pedophile so I'm sorry. I don't really agree with your view, but legally it is as you say, he's not a criminal if he doesn't touch minor, so I guess it's quite ok?? But I really don't like their relationship.
I don't justify pedophilia, that's not my intention. I don't support it but in special cases like here, I can understand it. (Note that because this is fiction, that may have contributed a lot in my judgment. In no way I will defend rl acts of pedophilia). ---> this is the only important thing when there's pedophilia involved in a manga, it is important not to justify it, so yeah, I agree with you
Sorry for misunderstanding you in some points!

Is this incest? NO. Ren is adopted. Haru and Ren are not blood related. If you still insist this is incest because they are brothers by the law (ridiculous tbh), same-sex couples in Japan adopt each other as an alternative for marriage. They can be each others brothers/fathers in the law and still have romantic relationship (obviously lol. I just wanna point out)
Is this pedophilia? Yes. Haru is an adult, Ren is still a minor and they are having a relationship. Aki and Shima are actually worried (comically) that their brother will be arrested. They are aware, people. Do they care? No
Is Haru pedophile? Yes and no. Yes he is pedo because of Ren, Ren is a child. And no because Haru is not really attracted to children. He hasn't shown attraction to other kids - only with Ren. He is not attracted to Ren because Ren is a kid. He is attracted to Ren, period. Ren just happens to be a kid (a really mature kid - who possesses personality of a more proper adult. More mature than Haru lol. And I think it's because of this that those who witness Haru and Ren's relationship don't really say anything because they know Ren can handle Haru.)
Is this grooming? For me it's not because by definition, "Grooming is when someone builds a relationship, trust and emotional connection with a child or young person so they can manipulate, exploit and abuse them. Children and young people who are groomed can be sexually abused, exploited or trafficked..." Haru on the other hand, do not have those intentions. Haru is just a flirt lol and a fan of skinship. It's not his intention to gain someone's trust so he can manipulate them. It's not Haru's fault to be liked by everyone(regardless of age or gender) no matter how much of an idiot he is. It's his personality that attracts everyone, and makes everyone trust him. Everyone trust him because he is an idiot who has no malicious intentions.
"...Anybody can be a groomer, no matter their age, gender or race."