Kurenai Hanafubuki

A 13-year-old girl named Sanada Beni becomes a Red ninja after reaching the required age and takes an oath to complete her missions as a descendant of her ninja family. Despite this, she is still considered a trainee. Four years earlier, she met a boy named Kiyoshi Makoto. She is now assigned to protect him at his school. As Makoto prepares for an entrance ceremony, Beni must ensure his safety while carrying out her duties.