I actually really liked these characters, and I liked the character designs and art style. I don't think it's as over the top cliche as everyone else is saying -- I've read stories that are a lot more cliche than this. I mean, really, a lot of the really well known BL stories like Target in the Viewfinder are about a thousand times more cliche than this one is. In fact, it missed several of the cliches yaoi manga seems to fall into; like the seme repeatedly raping the uke right away and it being okay because it's "love" (I'm not forgetting the bath scene so, yes, that's partially cliche, but I'm referring more to everything afterward -- Kuon never forced himself on Sunao, and Sunao had realistic reactions to things, I thought, like not really being sure about the advances) or everything being resolved in 2 days from "Hey I just met you and one of us is probably straight" to "Now we're both mutually in love forever" (The story spans a much longer time period than that) Also, I liked the background characters, like Asano, and the little brother. I liked the delinquent characters, and the main couple. I thought that in a lot of ways, their story was sweet and humorous.
All that being said, the main downside to this manga is that it's a bit all over the place. The plot isn't actually that bad (I found it to be an interesting concept) but it never fully answers a number of questions that rose to mind so it leaves a bit of a lacking feel. I have to agree with another reviewer that I was disappointed that the last chapter is some random oneshot. It has the feel of a story that's been started but never fully finished-- I was actually really hoping there would be a second volume or even a follow up oneshot. Also, it's hard to tell when Kuon's telling the truth and when he isn't, which would be fine except even the back story they give is a little strange for the way he is acting in present time. There are a number of things left unresolved, even small things like what exactly is Kuon thinking because he's super callous in some ways to people and then doesn't really seem to be that way elsewhere. It makes for an interesting dichotomy but it was never really explored.
In the end, it's unfortunate because I think this manga could have been awesome. Even so, despite the ambiguity the humor in the story and the main characters made me like it regardless. I even tried to check for other manga by this mangaka and was sad to see that very little of it has been scanlated. I would be curious to see if the other manga is a bit more cohesive. If Isaka Juugorou ever wrote a follow up to this, though, I would read it.