Okehh soo here's my favorite Japanese songs!

Freckles [Sobakasu] - Rurouni Kenshin

½ - Makoto Kawamoto (Rurouni Kenshin)

Sign - Flow (Naruto)

Blue Bird - Ikimono Gakari (Naruto)

Reboot- Jimmy Thumb P

The World Is Mine - Hatsune Miku (Vocaloid)

Answer - Megurine Luka (Vocaloid)

My most precious treasure [Ichiban no takaramono] - Girls Dead Monster (Angel Beats)

Brave song - Aoi Tada  (Angel Beats)

Lovers - 7!! (Naruto)

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If you know them all...CONGRATS