The concept is simple, but pretty hilarious. We have an 11-year old boy who looks like an adult, and a 17-year old sister who looks like an elementary schooler. When I read this, I was surprised and intrigued in how they were going to bring out this idea. The answer is simple: Misunderstandings on top of more misunderstandings. The best thing about this is that the characters still act their age, and as for the smaller sister, that's all right. But for an adult-looking elementary schooler, it leads to quite some interesting moments. Every small episode focuses on a particular scene or two, each having one of the main characters in another (awkward) situation. And if you're into that stuff, it's quite enjoyable. After all, with only 2,5 minutes per episode (not counting the ED), there's really nothing to lose either.
The art is quite average, but it's not bad. You can't really compare it to actual animes, but for what it's worth, it's good enough. The animation is decent, and strangely enough pretty good at some points, where the art also gets a small boost. The faces can look a teeny bit awkward from time to time, but there are no real flaws. The sound is pretty much the same, just your average set of BGM music, with the exclusion of an OP, but including a (short) ED.
As for the characters, we have the main two, Atsushi (brother) and Atsumi (sister), and for side characters, we've got a trio of elementary schoolers (2 boys and a girl), a high schooler who's Atsumi's best friend, and some adult side characters, including an unemployed neighbor. The casting isn't that big, but for a 3-min anime, it's more than enough to work with. All the characters are pretty flat, as in they don't really develop over time other than the two main characters. Nevertheless, they're fun and interesting, which for most is enough to work with.
In conclusion, like I said before, this is an anime you should watch inbetween animes. When you're bored of your regular anime, and just want something to switch gears a little. An entire season of this only lasts about 1,5 episode of an actual anime, so there's no real reason not to watch the entire thing. It doesn't feel rushed either, as each episode feels more or less like a scene from the 4-koma manga (compared to Mangirl, which tends to make me feel like I'm on a sugar high). It's quick, fun, and easy to follow. Just the whole concept is interesting enough to give at least one episode a try, even if it's something you're normally not into. "A Slice of Life anime with a fun little twist" is probably the best way to summarize it, and even if it's just for the whole idea itself, just give it a go. It's the best way to take a break from all the serious stuff, and just relax a bit. It did the trick for me, so perhaps it'll be a nice breather for you as well.
