It was later found that she was a ghost that had been haunted both Miwa and Hiroto since their vacation to the villa. As said by Mako, she is like an incarnation of hatred and sadness and it seems to have ghostly powers in the form of water. Eventually, she likes to torture psychologically Miwa and Masato as she is show how she tortures Masato when giving him the herbs. Mako slowly starts to fall in love with Hiroto since she sees that he has a kind heart and at the end, she let him go.