
Quick answer — Marika Hayashi voices Michiru in Darker than Black: Gemini of the Meteor, Hyakurin in Blade of the Immortal (ONA).
Marika Hayashi voices Michiru (Darker than Black: Gemini of the Meteor), Hyakurin (Blade of the Immortal (ONA)).
Michiru is voiced in Japanese by Marika Hayashi.