This is the real version of Supercalifragilisticexpialidocious in Japanese. People have posted a version with a much more anime style voice which must be a fandub or a version recorded by someone else (Mary sings Bert’s part...). Her voice is Eri Itou (voice of Belle and some other characters) and this version actually sounds like her. Bert is Koichi Yamadera who has voiced Disney characters like Genie, Donald Duck and Mushu.
Supercalifragilisticexpialidocious is スーパーカリフラジリスティックエクスピアリドーシャス in Japanese (als