I would call this primarily a drama, with comedy in it, not a harem or ecchi. This is legit. SO legit. Do not watch this unless you are legit, do not watch this if you can't handle anime on a serious level, return to your mediocrity and resume watching anime without substance or a deeper meaning.
Now that we have that out of the way lets start with visuals. Beautiful. The best anime I have ever EVER orver seen! So legit. The little details, the skills transitions, the little manouvers they put so much effort into creating but use only when absolutely neccessary as not to ruin the experience. The little things they add (like combo counters) are also a lot of fun.
Good music that will stay with you. You'll recognize and enjoy it each time.
The story is essentailly a dude in high school living life, this is simple and allows whatever they (the creators) could possibly want to happen. Many situations will arise.
Characters are lifelike, realistic, emotional, deep, and portrayed to catch all of their sides, flaws and positive traits. You may cry while watching this, Clannad will come at you hard, making you reflect on the way you've treated and the way you'd like to treat people. This is an anime that will catch your soul and make you look at it like you haven't in a long time.
Also the voice acting is amazing (i watched this subbed). The emotion and feeling they put behind their words is spectacular, everone feels like they match so well with their voices.
Overall, this anime is for serious watchers, it is too legit for anything less than the deticated. 9.5 For being amazing in so many ways, breaking steryotypes, giving episodes that go where they shouldn't (see extra episode) creating an anime that pulls itself from others for so many good reasons. This anime shall always stand in my eyes as something funny and deep enough to make me never forget. So legit.