That description so far has... little to no resemblance to the actual work. You would think from the description and tags this was pure fluff.
There are no signs of swooning whirlwind shoujo romance, as yet. It hasn't been horribly dark, either, but... We open in these initial chapters to two moody young men: One of them trying to work hard to succeed through difficult times, the other struggling with suspecting that his father has had a long-term affair and that the other other boy is his father's illegitimate child.
As to whatever merits the "comedy" tag, we have been shown neither head nor tail of it; even the "slice-of-life" tag seems a bit dubious; I feel like a "drama" tag is needed too?
The major caveat is this hasn't really gotten off the ground yet at all, 5 chapters in, so we'll see. >_>