Horimiya is an extremely cute, fun-to-read, solid shoujo with a great art style. I managed to read for a long while, usually in a I-don't-want-to-put-this-down style marathon, but was ultimately stopped by some problems that had my momentum screeching to a halt.

1) The author obviously doesn't know much about piercings...I think if you don't have many piercings yourself this is easy to ignore, but as someone with snakebites it's really hard to hold onto the suspension of disbelief when this kid takes out all 10-dozen of his piercings at his school and no one ever notices the holes.

(slight spoiler warning)

2) When they got into Miyamura's backstory with the self-piercing...first off, it was just a shock to see blatant self-harm (and that's what it is, he's explicitly trying to hurt himself, but I don't think the narrative wants to frame it that way) in my cute shoujo. I love dark stories, but there's a time and place and I felt like it betrayed the expectations the genre, and thus the reader. Secondly, again as someone with piercing knowledge, I couldn't stop thinking about how this story would unintentionally model piercing with a safety pin to lots of people...that's so dangerous.

3) Later in the story (well into the established relationship) these kids just start practicing amateur BDSM?? During school??? I had to stop there. Obviously kids are allowed to experiment in their relationships, but it just felt....irresponsible. I couldn't read it anymore. Maybe in a different story it would be fine, but in my light hearted shoujo? No thank you.