Since his parents lived overseas, Arata Kojiro, a second-year high school student who had been living alone since middle school, found himself facing the demolition of his apartment one day.

For the month until he could find a new place to live, he would be staying temporarily at the home of his parents’ acquaintances—a luxury apartment building where the school’s famous “three beautiful sisters” lived.

The eldest sister was an older, mature classmate with a slight air of vulnerability,

the second sister was a demure, gentle classmate with a competitive personality, cold but deeply devoted to her sisters,

and the youngest sister was a soft-spoken, innocent first-year student with a hint of shadow in her kindness.

Moreover, their parents were also stationed overseas, leaving the three sisters to live alone.

Kojiro is presented with all these conditions and begins a one-month stay as a temporary guest until a new place is found, but things don’t go as smoothly as expected…a certain incident becomes the catalyst for their relationship to gradually change.

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