for me, it's between Taiyou no Uta with YUI and Tsukamoto Takashi or Moon Child with Gackt, Hyde, and Wang Lee Hom <3
though of course, Kamen Rider movies hold a special place in my heart <3
particularly Kamen Rider x Kamen Ride W & Decade: Movie War 2010 <3 and Episodes Red and Yellow of the Chou Den-O Trilogy.