Sachiko Koshimizu

About

Age: 14
Height: 142 cm
Weight: 37 kg
Birthday: November 25
Blood type: B
B-W-H: 74-52-75
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.