Among Kasai Rinne’s classmates was the most popular girl in school, known as the 【Hime】. Her name was Katagiri Himeno. Her petite and adorable appearance drew more attention than anyone else on campus.

However, Rinne paid no mind to such a princess, spending his days devoting himself to his parents, grandmother, and siblings. Yet, even when his prominent siblings were praised, Rinne, who worked hard in the shadows, was always a forgotten existence.

One day, after a series of misfortunes left him in despair, Rinne decided to run away from home. While Rinne hung his head alone on a bench in the rain, the one who held an umbrella over him was his classmate, Himeno. “Won’t you become my family?” The girl who invited Rinne in such a way was also a young girl thirsting for familial love.

Their life living together, which began from playing at being a family, gradually became sweet and sugary——…!?