Nisekoi is full of interesting arc, I like all of them of different ways, but my favorite is clear: Romeo and Juliet arc.
It was by far the most meaningful arc in Nisekoi story. It began with the strife between Chitoge and Raku in the beach where he harmed too much with his words. The entire arc evolved perfectly with interactions between not only Chitoge and Raku, but also interaction among all characters. The entire cast fulfilled its roles perfectly and in the end Chitoge and Raku made peace, the entire misunderstanding was clarified. They reconstructed their friendship and, for Chitoge, she realized her feelings for Raku. This arc was a watershed event in the story.
Other arcs that deserve mention are:
The arc with Mikage, a great and funny character, who also brought the best of Marika;
Moreover, the Christmas arc with Chitoge's mother. Maybe Hana is the best mother I've ever seen in the mangas. This arc also showed a heroic side of Raku.
I hope that I didn't forget any good arc. XD
Last edited by Leoat12; February 02, 2014 at 10:13 AM.