user: Question: When Momoiro Clover Z is the vocalist how many japanese titles are there?
Columns: ['#', 'Japanese title', 'Rōmaji', 'Japanese translation', 'Vocalist', 'Episodes used']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '心のファンファーレ', 'Kokoro no Fanfāre', 'Fanfare of the Heart', 'Aki Okui', 'BW003 - BW025']
SQL:

assistant: SELECT COUNT("Japanese title") FROM "Table" WHERE "Vocalist" = 'Momoiro Clover Z';