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, there lived a pair of white butterflies. They were said to be extremely rare insect-folk.

Yukimitsu, a man who loved collecting butterflies, sought these white butterflies above all else. While wandering through the forest, he found two of them. They were Shiroha and Guest.

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

Several days later, Guest finally located Yukimitsu's house and broke in to rescue Shiroha. But the Shiroha found there would never move again.