Had to do a bit of searching to find the chapters that aren't here, but I did because I was curious to see how much I enjoyed this after I read the first chapter way back when it first landed here. Honestly, it's decent. Pacing is quite quick, but not too quick, however it's still quick enough that it almost hits that point of being uncomfortably fast. The MC is too neurotic for my tastes, but I also understand that I as a male in his 30s am not the target audience for this manga.
I'd say as an introduction to romance manga this is a good one I'd actually be alright recommending. It doesn't overstay its welcome since we're looking at an easy 13 chapters. It reaches a satisfying enough conclusion. Although there are plenty of elements of the romance that could be considered toxic which irk me a bit, but being teenagers it fits, and it's not like pure relationship without any toxic factors makes for an interesting story for the most part unless it's a smaller element in a different genre.
I personally give this a 6/10. I like to base my opinions on a lot of objective storytelling fundamentals since I have an extreme passion for storytelling, and I study all elements of it in all media. From a fundamentals perspective this is on relatively solid ground, but since I am not the target audience my enjoyment of this piece is a bit hindered due to how a lot of the story plays out. I definitely think the decision to make this a shorter publication works to the benefit of the story as I don't think it could have withstood too many more chapters. I'm fairly sure the frantic emotional energy output of the MC would grated on my much more if it had a longer run.