Amai Akuma ga Warau

Haruru Shirosaki is a girl with a busy schedule due to her father's work as a director. She is close friends with Mami and often visits a girls' school located across the street from a boys' school. One day, she spots a boy through the window of the boys' school. Later, after returning from school, she encounters the same boy, who tells her he will become her butler. She questions whether this encounter is real or just a dream.