The story at first sounds really generic. Small town, childhood friend who happens to live next door and is well endowed, and a mysterious "angel" falling from the sky. Yeah, so it is generic BUT throughout the series, the story gains more depth and eventually becomes interesting and enthralling. As a reader of the manga, the plot follows it to the dot and the pacing is also quite similar. Sometimes it does feel slightly rushed but keep in mind they are trying to condense about 5 volumes of manga into 13 episodes. The more you delve into the universe the more interesting it gets.
One word :wow
The animation in this series is flawless. The quality of the animation is simply amazing and this anime isnt even based on action. Animation is smooth and consistent throughout the whole series and camera angles are interesting and dynamic enough to add realism in dialouge. In every scene there is something moving and in most cases it is multiple objects (i.e consistant blinking, arm gestures etc). The bigger scenes that incompass massive explosions and giant crap are also done very nicely. Also, there are always different animations for the credits so there is more new animation packed in every episode.
Im not a real expert at sound but there is nothing wrong with the sound in my opinion. Ambience sound are consistant and sound realistic. The voice actors were nicely chosen and all act out their respective characters well. I've heard people say that Tomoko's voice (the protagonist) is annoying but i've had no problem with it. Maybe i'm just tolerant?
Since there is always a different credit theme, it means different songs. WOW. Some of them are just plain silly and some are strangely addictive. Also watch out for ep 10, two great songs.
The character designs are nice and certainly live up to the generic ecchi anime standards. With this in mind however there really isn't anything ground breaking when it comes to the characters. Still though, like the plot line there is more than enough character development to keep the series interesting.
An anime that probably has the highest production value of the season (and dare i say the year), a deep plot and truckloads of humour, this anime cannot be missed. Seemingly neglescted due to its appearance as a "generic", this anime is anything but. A must watch