Ninkoi - Kakurenbo Hichou

A man named Mikado Shuuji possesses an unusual knife used for cooking, which is actually a renowned short sword signifying leadership among ninjas. This draws the attention of several ninja women seeking to reclaim it. Hinamori Botan is one of these women, but her attempts to retrieve the blade often result in her unintentionally revealing more of herself. After deciding against stealing the sword or harming Shuuji, she chooses to become his ninja. Now, she is tasked with defending him from other ninjas who aim to take the sword and his life.