the ayu/nami melody sounds really similar in terms of arrangement.. I can't hear nami's voice clearly but it seems like the vocal melody is different.. so I assume it's only the background music arrangement is similar.. well probly if someone searches hard enough he may find lots of songs with this similar arrangement as well.. afterall music has been existed on earth for like ?? years and it's not surprising to find similarities among different songs
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and i can't watch the youtube link on the first post.. do i have to sign up at youtube for that video??