I really enjoyed this drama. The summary is misleading, but "Sana is a ninja that has arrived in present day Japan. She now follows Masako Murata as her new boss and attempts to eradicate evil that is rampant in modern society." describes the drama well enough. The short length of a jdrama usually forces the writers to focus on either the story or the characters, which means the other part is often underdeveloped. Tenchuu managed to balance both parts, which meant I connected with the characters on an emotional level as they went through the events of the story. The acting was good, but it didn't amaze me. Nevertheless, it was good enough for me to keep watching. Overall I did enjoy the drama and would watch a season 2 if it was released