The Yamijima Island Reality is a reality/dimension created by Mother. It serves as the main location for Forbidden Siren 2. This reality was created in 1975 at 12:00AM when Kanae, a Mother Avatar, was unable to complete her mission due to rebelling against Mother, so a red tsunami engulfed Yamijima Island. The entire population of Yamijima were whisked into this world, except for Shu Mikami and Kanae, who escaped by boat. To the people in the real world, the island was deserted, creating a mystery surrounding it. A loose underwater cable was used to explain the power outage the island suffered from in this event, but an explanation of the disappearance of the people themselves was left unanswered.

The creation of this dimension meant that the real Yamijima island was folded in time, allowing people from different time periods to co-exist on the island. The ultimate purpose of this reality is to ensure that Mother uses it as a means to escape into the real world through Spider's Thread.


This reality is depicted as the same as the real Yamijima, including buildings, items and areas. When the red tsunami struck the real Yamijima, everyone on the island believed it was the real island, although Yuri reveals that this world is unstable. Even though its properties are the same as its real counterpart, time can allow something as small as a glass ornament to reappear whole after shattering into pieces.

Known Inhabitants Edit

From 1975:

From 1985:

From 2003:

From 2006:


Ultimately, this reality was unstable due to the time-fold, which meant that sooner or later, this reality would revert to what it once was - nothing. As Spider's Thread collapses, Mother sends herself, Mamoru and Ikuko into her world, a red rocky dimension with red water as a sky. Eventually, after her defeat at their hands, a red tsunami appears and plunges the survivors into different worlds: Mamoru, Ikuko, Soji and Tsukasa are sent to a world where Mother and her avatars never existed, whilst Yorito Nagai ends up in a world where humans are old myths and Yamibito walk among like humans.

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