Ohtsuka Karin is a single mother currently serving as a substitute teacher for the school district, with preference to the school her daughter Ohtsuka Fuyumi is currently attending. Despite having a kid, she is single as her previous relationship was a simple fling that went nowhere and left her pregnant with Fuyumi. She, however, is more than available for anyone who works for her favor, and willing to give her another baby with intent to marry. Just don’t let Fuyumi know… her fury knows no bounds!