水澤 ちづる

An office lady and Reiji's older sister. She is a kind and helpful older sister at home while also a diligent and capable employee at work.

She has a strict and tough image and is thus never hit on by men.Though she had a boyfriend and the experiences of a normal girl when she as young that all changed when she started working.

Knowing the pleasures of a woman and unable to manage her desires she secretly comforts herself every day making sure Reiji doesn't find out.