Having read the 11 volumes of Oyasumi Punpun (by the same author), which I'd easily rate as a 9/10 or 10/10 personally, I decided to read this manga. Unfortunately I found myself disappointed.
Starting out, there wasn't really much in particular that hooked me into story, except for maybe the fact that the main character is somewhat cutely drawn. Regardless, having some awareness that something dramatic will occur later on during the story, I read on with an open mind. Ultimately though, I was disappointed by the twist.
Though the short two-volume format doesn't help matters, apart from the heroine, I feel that the characters were not really fleshed out. They had some soliloquy here and there, but in the end I couldn't help but viewing them as shallow background characters. I couldn't even find them likable. Due to this lack of character exposition or development, the main turning point of the story seemed not so much a tragedy, but an unbelievably melodramatic and selfish act of a character that I can't imagine becoming emotionally invested in. I couldn't even take the main romantic relationship of the main character and her boyfriend seriously.
Even if this story did pull at my heart strings. I still don't think I'd be able to describe it as very creative or insightful in the manner of the manner of the author's later work.