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Sachiko Koshimizu (輿水 幸子)Age: 14
Height: 142 cm
Weight: 37 kg
Birthday: November 25
Blood type: B
Hobbies: Making clean copies of notes
A narcissistic teenager who's obsessed with being the cutest. She has a sadist strike, and likes to show her superiority towards others in pretty aggressive ways.
In the anime, she's in an unit with Sae and Yuki called KBYD.