So, this manga is definitely a gem, and it's very popular for a reason. If you're able to get past the first volume, you're in for a ride. It's basically a manga about at toxic relationship where boundaries are crossed, verbal abuse, communication problems and more. Its not your typical yaoi where its kiss kiss fall in love. It's a slow romance.
Basically, the manga shows a lot of toxicity between the couple, which are real life issues, compared to other yaoi's where its like "oh r***, well i love you now."
Over the course of 20 years, the manga has developed amazingly, and the characters just blossom into these amazing people. Lots of comedy too, its hilarious. And also serious drama, and it highlights serious issues that are present in real life relationships. The characters learn about communication, learn about their wrongs, and learn about their problems. Also, some characters have traumatic pasts, and talks about homophobia and how they have fallen victims to it.
There are censored sex scenes, however, minimally censored. I will say, my favorite thing about this manga is that the sex scenes aren't gross. They feel romantic. They aren't hentai-esque, but still hot at the same time.
I WILL say, however, as much as I love this manga and its a solid 1000/10, the 2nd chapter of the first volume /is/ a tough read, and it is dub-con until i'd say maybe volume 4, maybe 3, depending on the scene.
In short, if you read this, expect just a toxic relationship between initial friends to lovers, one sided love, and a tsundere who can't admit that he really is in love with this guy, because he was never taught to express his feelings, and feels awkward around romance. Expect the most sweetest, sappiest, cutest scenes, and expect to see a total raging asshole turn into a soft and shy person, yet still holding his boundaries. Expect to laugh too! This series has me cracking up constantly.