About

Yuuhi is a mysterious young girl who has converted an apartment room into a laboratory. Her age is unknown, but she possesses a high-level intellect unimaginable from her appearance, spending her days alone conducting chemical experiments. One day, she met Guest, who lives in the neighboring unit, and grew fond of them. Her affection manifests in ways typical of her appearance, such as demanding to be carried, but also in terrifying ways unique to her, such as begging Guest to be a test subject for new drugs. However, despite their unknown ingredients, her medicines always warm Guest's heart and body. Today, once again, Guest visits her room at her request.