If you're using VCV voicebank, you need to input VCV lyrics.
CV lyrics can either be in romaji
[ka][e][ru][ u][no][ta][ga]
or in hiragana
[か][え][る][の][う][た][が]
However, VCV lyrics consist of vowel-consonant-vowel in a mix of both. Each note "borrows" the vowel from the previous note.
[- か][a え][e る][u の][o う][u た][a が]
In the case where there's no previous note, you use a hyphen instead.
To automatically convert lyrics from CV to VCV, you can use a number of plugins. One of them is iroiro, which you can download here.
https://ux.getuploader.com/bizz_v/download/173