This...this's...I'm not...I can't...GAAAH! Ok, this's really conflicting for me, because it's not necessarily a BAD manga, but calling it good is a bit of a stretch. I think the main problem is the story. I'm going to get a bit mathematical, so please bear with it, it's not that bad.
Ayase has to get out of his debt of $2,000,000,000 by selling his body for $500,000 each time. Do you know what that means? It means that he has to be brutally raped by this SCARY concoction of a man (named Kanou) 4,000 times! If you divide that by the number of days in a year (365), then he has two options:
Be raped by the scary man 10-11 times A DAY for a whole year, or be raped by the scary man once a day for 10-11 YEARS! Nevertheless, I'm sure Kanou will have days where he's extra pissed off and rape him more than once. Let's say...2-5 times. At the very LEAST, Ayase will be raped 2,000 times in 4-5 years. At the very MOST, Ayase will be raped 800 times in 1-2 years. Either way, Ayase's gonna be there for a long time experiencing unbearable pain.
This's...insane. This's way too much abuse that ANY person can handle without killing him/her/itself! And down right cruel if Kanou "loves" Ayase so much. And cruel if I have to use this much math! This's YAOI, who wants to think about MATH in YAOI!?
WHAT I'M TRYING TO SAY: This story has too much material. No matter how creative you are, how spectacular your art is, how much you PAY US TO READ ALL OF IT (actually in that case, I'd read it all), it's going to get really boring and repetitive. And we're talking about a shouta being raped 4,000 times!
Notice how I don't use the word "sex". Because there is no "sex", just flat out, pitiless rape. This innocent little guy is going to suffer some severe physical AND mental pain...if this manga was more realistic. But no, rape is totally ok, absolutely 100% fantastic. Any manga that does that loses respect from me.
Are the characters any good? Well...not really. Ayase is either terrified or adorable, and Kanou is either gentle (for 5 seconds) or abusive. The only thing that's interesting is if Ayase's gonna make it out ALIVE!
Saying all these things makes it seem like I hate it but honestly, it does have that interesting pull to it. So if I were to be fully honest, if you want LONG CONTINUOUS RAPE, then read it. Otherwise, just go read a one-shot.