Anyone know how to make renri sing in "s"

Lounge / 大厅 / ラウンジ
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1

So i wanna make renri sing the lyrics “ラビリス” but i want to make her sing to “su” to “s” anyone know how to do it?

「いいね！」 1
2

Remove the u phoneme from above the note.

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「いいね！」 1