The line between operative and target blurs completely. Kagetora reveals he knows Haru is a spy but chooses not to report her because he sees her as a potential escape route. The agency, sensing Haru’s wavering loyalty, sends a cleaner—a ruthless assassin posing as a gym teacher—to eliminate both Haru and Kagetora. The finale of the first major arc sees Haru holding a gun to her handler’s head, screaming, "I will absolutely not let you hurt them!" —a direct inversion of her original orders.
The series is heavily discussed for its use of "forced proximity" and "blackmail" tropes common in the ecchi genre. Reviewers on platforms like Reddit often highlight the series' extreme tension and the "luck" of the protagonist in surviving dangerous missions. Secret Mission: Sennyuu Sousakan wa Zettai ni Makenai! secret mission sennyuu sousakan wa zettai ni
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