This is one of my favourite shounen ai manga. I say shounen ai, because even if it's got sex in it and it's labeled as yaoi, for once it was actually about the characters and exploring their feelings for each other. It doesn't feel like a typical yaoi at all. It actually started out very realistically; handjobs. Whenever do you see handjobs in a yaoi!? Almost never! They always jump straight into the sparkly buttsex.
Well, there's an actual pace in this manga, which is why I love it. The main character, Kasukabe, loves being popular, so he tries to act cool and collected to gain favours with everyone, even though he's really just a wimp. But there's another guy (Misato) who's getting more popular than him, and it annoys the hell out of Kasukabe, so he starts a rivalry with Misato.
On a day where Misato is trying to escape his fangirl following, Kasukabe hides him. One thing leads to another, and Kasukabe tries to act all cool and experienced as he kisses Misato.Kasukabe is actually super inexperienced, much like Misato, but he pretends to know what he's doing, whereas Misato just keeps getting more flustered. Afterwards, they do a lot of kissing in secluded spaces, with Kasukabe jerking Misato off (Kasukabe doesn't allow Misato to jerk him off).
Ok, maybe I'm biased - I love stories that start with two guys having a rivalry and then act this out in sexual ways, and start giving each other handjobs (my OTP pairing is exactly like this), and this manga definitely filled in a spot I could never find in any other yaoi.
The only problem I have with this manga, is that it should have been longer. Kasukabe never shows his flustered and panicked side, so Misato has only seen him as calm and collected, when his inner personality is anything but, and that annoys me because Misato never gets to know that side of him.
Other than that, it's a great manga about two guys fooling around with each other, not knowing what they're in for as they steadily fall for one another. I really recommend reading it if you love shounen ai. Not so much if you're a huge yaoi fan because as I said before, it's not your typical yaoi at all (hence the reviews that call this 'overrated', they expected something else).