(Ill try to keep it short and spoilerless)
This manga is one of my favorites, for several reasons.
First one is that her characters are in my opinion one of the best BL out there. Especially the protagonists. Like Natsuki.
You can see nicely how do thoguhts of your average homosexual guy on college flow. Usually they just show them as horny sex machines, but in the truth, theres alot more other important things going on in their heads. Fear, insecurity, hesitation with every move, skepticism and others in line. But Natsuki is a cool guy, and still stays strong considering his situation.
Soo its pathetic
And Komano is greatly developed too. Hes like a curious beastie. Again is totally on the spot as how (should?is wanted to?) react. He never let me down as i was reading the manga. My hat down for you Mr. Komano.
Than we have a seccond storyline: The summer of the end of the world and its shape.
It is a nice story too, but it got outshined by Natsuki/Komano one. However i still think its worth of your time. Even tho the Apocalypse got me skeptic about the quality, i wasnt let down. The emotions and atmosphere that this story gives off is still very intriguing. Melancholic, undefined, confused and lastly it gives you peace with a decent perspective into the better future.
All in all, the only thing i minded was that the stories were too short. Especially the Komano/Natsuki. I wouldve read a bit more about how their relationship developed. Even tho it couldnt get any better, so maybe its really ok like this, as sensei left it. Keeps the focus on the psychology and not on the storyline ( Kenji fell in love with Yamamoto and made Yuta angry and jealos...and it goes...)
so yeah, maybe its fine like it ended. Besides we have Kare no Barairo no Jinsei. \o/ Hurray!