From the summary, we can tell it's going to be a love-triangle. The simplicity of the summary already captured how, what, this manga will bring us, simplicity of love. How simple it is to be tangled in it, how simple one can be cruel and to be unaware of it. Yes, all of this relate to the manga.
The mangaka did a great job in the story-telling. It's one of the highlights of her works. She managed to flawlessly wove the elements necessary to make one affair seems more heart-wrenching. The story isn't really brilliant, I'm sure some of us have encountered this type of plot but we can't really escape from cliche, right? That is why characters interaction and story-telling is vital to some of us who are looking for 'a story'. For me, this manga has both.
Moreover, it is also hugely due to her style of art, which is uncommon in yaoi mangas but yet is perfectly fresh and fits the mood of her works. The art is simple, very basic and unelaborated. It felt honest. This really compliments the bitter sweet feeling this story gives off.
To those looking for hot sex, you can stop reading this and find other manga. To say this, I'm not saying the sex scenes are uninteresting but it will be, for those who didn't get into the story. Honestly, I was gripping my hands due to the story in the sex. It helps to portray the bitter action of the character.
If it weren't for the comment below, I wouldn't even think to comment since I feel like everyone can predict what to be expected but I had to since I don't want anyone to be put off without even trying. Some, perhaps will agree and perhaps hate the character/s for doing such a cruel thing but I think the characters' actions are believable without exaggeration. It is what certain people will do when they are truly in love.