With Touringram as her guide, Yoko has left the shelter with android Airi to tour the places around Japan her older sister, Chitose had before sea levels had risen. Along the way, they meet various entities. As they travel and scavage for food, she dreams what it would have been like to spend time with her sister pre-apocalypse. First...

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...