Nakaimo ~ My Little Sister Is Among Them! contains episodes 1-13 of the anime directed by Munenori Nawa.

The terms of Shougo Mikadono's late father's will are strangely specific: To claim his substantial inheritance, Shougo must first transfer to Miryuin Private Academy, find a nice girl from among the student body, and convince her to marry him. As twisted and unromantic as that demand may appear, it does seem doable, right?

Unfortunately, there's an even greater moral obstruction standing between Shougo and a rich happily ever after, as one of the students attending the school is Shougo's long lost little sister… and he has no idea which one she is! Can Shougo navigate this minefield and find a future bride without committing a major sin? And if his little sister is revealed, will it be in a manner that's socially acceptable? Insanity is hereditary and Shougo's about to go sibling crazy!

Special Features: Commentaries, Japanese Trailers, Clean Opening Animation, and Clean Closing Animation