It's been 2 years since Shinpei Ajiro has been away from his home Wakayama, situated on the remote island of Hitogashima. He was returning to attend his childhood friend Ushio's funeral. Her family the Kofunes had adopted him when his own family passed away long 10 years ago so she was like family to him. While on the ship heading...

Ai Ohto with heterochromia (different coloured eyes) has shut herself away, skipping school after bullying lead to the death of her only friend. One night while sneaking out, she finds a dead firefly and buries it. To her surprise she finds it talking to her and is offered a free Wonder Egg. Thinking it was just a dream, Ai wakes up...