Part holy shit, part holy cow, part WHAT THE HELL.
Served with a layer of awesomeness, intensity and an allure Kunieda-sensei knows best.
I personally think this whole tanko (read the raws) is basically a whole twist of the (kind of usual) yaoi storylines here. My illiterate take of the chapters I read:
1st chapter is a play of the 'brother-in-law' conventions; and the recently popular 'single father' storyline; taken a dark twist from a most unexpected perspective; the child. And how dark it is.
2nd chapter is a play of the 'first time' storyline; a play that took somewhat a tragic turn at the end. Not bloody as it is sad; Think Natsu Jikan.
The 3rd chapter, one that has been scanlated is, if you may use faux-intellectual literary term, a meta-twist of your usual happy endings in yaoi; you know, 'depressed guy meets mysterious guy, they fell in love and live happily ever after.....'
....what happens after the ever after? In this particular story, ennui, that leads to gruesome ending.
I forget the 4th chapter, sorry.
5th chapter is half romance, half black comedy... and satire, personally speaking. Of expectations and imaginations and judging the cover of the book.
6th chapter, that is the sequel of [url=http://mangaupdates.conexionsite.com/series.html?id=15285]Mimitabu no Riyuu[/url], is a dose of sweetness that sticks like sore finger here (I suspect weird publishing decisions), but nonetheless is playing with the conventions of 'happy endings', that is the 'forever' part; the characters grow, and sometimes taking a....weird turn.
Overall; it's a very good, if twisted read. Not exactly Future Lovers, but brought with the same amount of control like all of her works, this one a delicate touch between madness and melancholy and -- maybe, happiness.
Waiting for the scanlated version will be worth the wait.