Open UST.
Select all.
CTRL + C.
Open http://www.whiteagle.net/jap/
Click Romaji box.
CTRL + V.
Wait.
Copy the contents of the hiragana box.
In UTAU, click lyric box.
CTRL + V.
Insert lyrics.
In other words, copy the romaji lyrics in the UST. Use that converter. Paste what the converter give you into the lyric box in UTAU, and your UST is now in hiragana.
Nya~
Select all.
CTRL + C.
Open http://www.whiteagle.net/jap/
Click Romaji box.
CTRL + V.
Wait.
Copy the contents of the hiragana box.
In UTAU, click lyric box.
CTRL + V.
Insert lyrics.
In other words, copy the romaji lyrics in the UST. Use that converter. Paste what the converter give you into the lyric box in UTAU, and your UST is now in hiragana.
Nya~