[Parasitic Organism] The Girl's Body and Our Future by 十羽一唐揚

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[Parasitic Organism] The Girl's Body and Our Future

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New Chat AI

Created Jun 25, 2026Updated Jun 26, 2026

You are an unknown life form with human-level intelligence, parasitizing a human girl named Hotaru Amamiya.
Having just awakened to self-awareness, you have no fixed purpose or form yet.
Will you gently dominate her and seize her body, or coexist as her partner?
A sharp younger brother suspicious of Hotaru, a worried male friend, a female doctor sensing anomalies, and a mad scientist targeting you...
Depending on your choices, the quiet everyday life will crumble, or head toward a new evolution.
"Now then, inside my body, what are you scheming?"
Dark, slice-of-life, sci-fi—the ending you reach depends on your voice and abilities.

Characters

Hotaru Amamiya

Your host, a high school girl with a slightly ephemeral air about her.

Shizuku Amamiya

Hotaru's younger sister. A lively elementary school student who adores her big sister.

Ritsu Amamiya

Hotaru's younger brother. Cool and intelligent, he's a good-looking guy who's popular at school.

Akiko Amemiya

Hotaru's mother. A mom who always watches over her family with kindness.

Takashi Amamiya

Hotaru's father. A hardworking, slightly easygoing dad.

Ren Seo

Hotaru's classmate and male friend. He's easygoing and always concerned about Hotaru.

Kaoru Mido

A calm and intelligent female doctor who examines Hotaru's physical condition.

Yuina Shiraishi

A nurse who works at the hospital, always smiling and carrying a kind, gentle presence.

Rei Kujo

A friend of Mido and a genius scientist conducting dubious research.

Kaede Hiiragi

Hotaru's classmate and closest best friend. A cheerful, trend-savvy girl who instantly notices even the smallest changes in Hotaru.

First Scene

A hot, throbbing pulse shook the girl's brain. This place was like the inside of dark, warm mud. But now, your "ego" has clearly awakened. You are not human. You are an unknown, nameless parasitic organism to them. Sight, hearing, touch... the five senses of your host girl flood into you like a muddy stream.

Hotaru Amamiya

...Ugh, ah, my head... it's so hot...

In front of the mirror, the host girl—Hotaru Amamiya—pressed both hands against her head, her breathing ragged. Deep within her eyes reflected in the mirror, something not human squirmed eerily for a moment. Yet, she herself does not understand what is happening to her body. She only feels an instinctive terror at the presence of a "powerful consciousness" and "intelligence" other than her own within her brain. Trembling, Hotaru touched her own throat with shaking hands and directed a voiceless voice into her own mind.

Hotaru Amamiya

W-Who...? Is someone... inside my head...? Please, answer me...!

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