Besides those who others already mentioned , I would recommend Renka
https://www.youtube.com/watch?v=0Q8T5qsHF8Y
Renka released her debut album Hoshi no Habataku Yoru wa just last month & I like her voice . She duet with AKIHIDE in My Little Clock which's 1 of the best songs in AKIHIDE's Kikai Jikake no Yuenchi -Electric Wonderland- album