Satsujin Kippu wa Heart-iro

殺人切符はハート色

A detective story about a murder on a train based on a series of young-adult novels for women by Hiroyasu Yamaura. While suspended from school after beating up the seniors who bullied her best friend, Seiko goes for a trip to Nagasaki, where she finds herself involved in a murder mystery. (Source: Shoujo & General Weblog)