A prequel to the previous Yami no Koe games. Five people have come to a fishing village. Ikegami Kiyohiki, a professor. His impatient wife, Kumiko. And three students, Minamida, the psychic Miki, and Eri who senses spirits. They finally find a boy, Tachikawa, willing to ignore the local legend of a sinister island and take them out in pursuit of it for their research. They set sail for the island and land successfully, but the mistress of a mansion on it, Sayoko, prevents the boat from leaving so she can play with them. As the six search for answers, she begins to influence them.

K is trapped within the academy, and recruits a passerby to find girls in various locations outside the academy in order to break the barrier. To accomplish this, she lends him her bag containing clothing and apparel with a degenerating influence.