4 minutes in, the plot has already started and fan service is already happening.
If that's not a great start, I don't know what is.
People like making fun of Minato for failing the entrance exam, not once, but twice. And his luck just seems to get worse, or is it better? It's not real clear.
The Sekirei, mostly girls with abilities who fight each other in secret. Nobody else is allowed to know, besides their partners, called Ashikabi.
There is a lot of fan service, so if you aren't into that, this probably isn't for you. It all plays into the story though and meshes well, since that's one of the paint points of it.
Musubi is adorable and sexy, she's so sweet with Minato and the romantic parts between them are really nice. A while later we meet Kusano, who definitely rivals Musubi in cuteness. After that we meet Matsu. She wants Minato all to herself. She's a little perverted, but if you're like me, they're usually my favourite sort of characters. Then finally we meet Tsukiumi.
The story is really interesting, and if you like Ecchi/fan service, you should definitely check this out.