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Saya Irino (納野サヤ)A student counsellor at Mato and Yomi's school. Despite claiming to offer advice to help students dealing with their personal issues, sometimes she has the habit of performing moral harassment on them to make their minds unstable for unknown reasons. She is usually seen preparing, drinking and serving different brands of coffee to her guests. After befriending Yuu in high school, Saya comes to learn of the other world from her, learning of her link to Black Gold Saw. After Yuu and Strength switched places, she became determined to protect her, as well as to prevent the impact Black Rock Shooter has on the real world.