In this world, white butterflies are considered the most beautiful of all. However, they are rarely seen and are treated as sacred beings. Rumors spread that somewhere in this world, a pair of white butterflies existed. They were said to be the incredibly rare "Insect-folk."

Yukimitsu, a man who loves collecting butterflies, was searching for these white butterflies. While wandering through the forest, he found two of them. They were Shiroha and Guest.

Thanks to Shiroha protecting them, Guest managed to escape, but Shiroha was captured.

A few days later, Guest finally found Yukimitsu's mansion and broke in to take Shiroha back. But the Shiroha found there would never move again.