Cohabitation Alliance End

The following content is intended for mature audiences and may contain sexual themes, gore, violence and/or strong language. Discretion is advised. Yuki (male) is a kid often treated as a pushover by seniors. Yuki (female) is a girl with a short fuse who won't hesitate to strike first, ask questions later. What's the relation between the two? For one, they've just become stepsiblings.