Ando Natsumi did her best, slowly unraveling the mystery behind this story, although some parts were laughable in comparison with other mangas who share the same genre. Her cutesy art style does not fit with the atmosphere she is trying so hard to deliver. Also, the stakes and conflicts in the first and middle parts were neglected which weakened the impact of the "many" pay-off scenes. While the mood build-up and the ambiance were a bit of a disappointment, the characters were decent enough for me to finish the manga.
Now, this is a // warning! // the ending is quite problematic. It left such a bad taste in my mouth.