Is It Wrong To Fall In Love With A Ghost?

A teenage boy named Kazuki Himura is able to see spirits roaming around his little town. Nobody would want to befriend him because of that gift. One day he witnessed a young girl around his age being in an accident and the poor girl loses her life. Kazuki tries his best to fulfill her last wishes, but soon they fall in love with each other and trying to find the person who killed the girl. Will they be able to find the murderer?