Shinobi Quartet  

Shinobi Shijuusou, シノビ四重奏〈カルテット〉, シノビ四重奏

The next generation of the esteemed Manaka family is Chouko Manaka, who has recently enrolled in high school. She feels restricted by the constant presence of bodyguards and yearns for genuine companionship. Despite her father's concerns, he agrees to let her attend Mizonoo High School, where many students are training to become shinobi. In exchange, Chouko will have a right-hand man by graduation. On her first day at school, she encounters the son of their butler and is surprised when he expresses his desire for her to be his master.