Their world has fallen into dark times -- a mysterious void has made some places (and even animals) impossible to touch, causing major food shortages. A strange and deadly disease that has killed off a large percentage of the female Ribika population is also spreading.

"Rhyme" is an electronic brain online game using a virtual world as its setting which Rhymers are going crazy over. Aoba shows no interest in it, thinking that it would be nice to just live peacefully with his grandmother. But the disaster that will shake up those peaceful days has already begun...

Hisao awakes in a hospital bed and is told that he has a rare heart condition that causes his heartbeat to sometimes become irregular. Due to this, his parents have enrolled him in Yamaku, a school for disabled students of all kinds.

In order to avoid being cast out, Jed masquerades as a young boy and lives in a derelict tower on the outskirts of town. One day a mysterious treasure is stolen from the city church. Our heroine learns that not only do magic stones exist and are hidden within the city, but also the secret of her origins.