Hentai Douchuu Banbanzai

Japan at the end of the Taisho period.

In a peaceful rural town, there was a beautiful girl called Thumbelina (Oyayubihime).

She was born small and had a lovable, doll-like appearance.
Having lost her father at a young age, life with her sickly mother was not easy, but it was by no means unhappy.

The night before Thumbelina's 16th birthday.

Thumbelina, who had noticed something strange, woke up to find her house engulfed in a sea of fire.

And beside the futon stood an old woman she didn't know...

[Translated from official website's story synopsis]