Satsujin Kippu wa Heart-iro
Heart-coloured Killer Ticket
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 Yamaura Hiroyasu. Seiko, while suspended from school (she has been bullied) goes to Nagasaki, where she finds herself involved in a murder mystery.
(Source: Shoujo & General Weblog)