MRXD-008 Her older sister is a troublesome masochistic sister.

You yourself, honestly. I've been dating my current girlfriend for almost three months now. Her sister, Ms. Azusa, works in research at a pharmaceutical company in Tokyo and is the kind of woman who looks good in glasses and is very intelligent. The other day, when I was staying at her house, I ended up alone with Ms. Azusa. At that time, she suddenly said to me, 'Hey Seii-kun, don't call me sister. I want you to call me...'Mother Pig'...'