What I enjoy the most about this manga is that it's very light-hearted & heartwarming at the same time. What's more, nobody really makes a big deal about their gayness. People just react towards their idiot-coupleness instead.
Although the first 2 volumes rely on some clichéd tropes in BL, I love how each character & their relationship has developed so much from volume 3 onwards. I usually get bored if the author drags out the couple's story after they get together, but I love this couple so much and how they interact lovingly with each other. Drama occasionally happens (hence why it's in the genre) but most of the time they communicate so well.
Even though the tsundere trope is often overdone, in this manga it is funny and doesn't feel out-of-place. It makes sense for their initial relationship (rivalry). In the end, uke can honestly express his feelings (dere), the gap moe fits the story.
Some miscommunications/drama along the way, but overall healthy and consensual relationship. Believable drama because uke's insecurities are strongly tied to his past (aka it has some grounded reasons, not just random insecurities).
Believable relationship development. Great character development, you can clearly see several traits change. From hiding to more honesty, from lack of empathy to more caring, etc.
Journey of love from young to old, "until death do us apart" type of romance. Beautiful story, beautiful development. Believable drama, considering the traditional Japanese expectation of having a secure job + family.
Heartwarming and cute. Interesting take on what it's like to have a family member in LGBT relationship, and how it affects how you view relationships.
Slowburn. It's nice to have a fudanshi BL trope without the normal smut route like in other works. Believable development.
Cute and interesting dynamic between characters. Sequel to Yamete Kudasai, Mabushii Desu which is also a good read.
Narcissistic character portrayed funnily, not overbearing. Cute dynamics.
Harenochi Shikibu