Omae wo Onii-chan ni Shite Yarou ka!?

Yoichi, raised without knowledge of his parents, learns of his father's death and discovers a will requiring him to select one of five candidates to be his little sister. Each girl expresses her own reason for wanting the role, ranging from a desire for a lazy life together to claims of destiny and personal goals. The candidates display various peculiar traits, and a comedic dynamic unfolds as they interact in a sibling-like setting.