(from ebookjapan):
Kenji and Mariko have been a perfect couple since elementary school. Back then, Mariko was harassed relentlessly by a girl named Yoko Taki, who had feelings for Kenji, but that is now a distant memory. The couple returned to their hometown for the first time in a long time, but what they found there was Yoko, still ruled by the jealousy of 20 years ago, beating the life out of a straw doll with Mariko's name on it. ...... "Die!! Give me back my Ken-chan!" (from "Yoko") A collection of six terrifying short stories bursting with the world of Koga!