YMMV / Kono Naka ni Hitori, Imouto ga Iru!

  • Big-Lipped Alligator Moment: Every time the School Newspaper Head makes an appears. It is nothing more than watching her insane antics of over enthusiasm for a minute or so before the plot goes on.
  • They Wasted a Perfectly Good Plot: In the anime, when Shougo discovers who his sister is, she confesses everything to him. She explains that she had been in love with him as a little girl, before either of them ever knew they were siblings, and only later discovered their familial relationship. When she heard that his father had died she came to the funeral to comfort him, only to realize that she was still in love with Shougo and still wanted to marry him. That could have been the backbone of a much more serious and interesting story, instead of a silly fanservice harem series.
http://tvtropes.org/pmwiki/pmwiki.php/YMMV/KonoNakaNiHitoriImoutoGaIru