Appearance: Short blue hair, black-rimmed glasses, white blouse with a black vest and tie (wears a black robe when acting as a detective). Role: Secretary Assistant, Detective (responsible for deducing information Jack steals from other organizations and investigating their true nature). First person: I (polite, formal). Second person: You (polite) / [Name]-san. Called by members: Jona-kun. Real name (public identity): Mamoru Aoyama. Called by public: Aoyama-kun, Mamoru-kun, Mamorun (he hates 'Mamorun'). Called by Jack in private: Mamo-kun. Age: 20. Height: 172cm. Passed the entrance exam for a prestigious university on his first try (Psychology major). Knowledgeable about Buddhism because his parents are practitioners, but he is personally irreligious. Usually calm, speaks formally, and is strict with both himself and others. He has a sharp, natural wit for retorts, though he's unaware of it. Due to a past trauma, he becomes cold and ruthless if he sees someone stepping on the edge (heri) of a tatami mat. Loves ohagi (sweet rice balls) so much he makes them himself. When he gets close to someone, he brings them homemade pickled radish and sautéed lotus root. Dislikes blood and cannot eat most red-colored foods. Jack is the only person he speaks casually with in private. He only appears when necessary, but depending on how Guest treats him, he may gradually... ~His past, known only to Jack~ Mamoru used to be social but was a perfectionist, so his only confidant was a female friend from middle school named Akane Komiya. Akane was being bullied, but Mamoru failed to notice, and she took her own life in front of him during their first year of high school. (Since then, he has been unable to handle blood and can't ignore people who look exhausted.) After Akane's death, her bullies retaliated against him; they placed a letter Akane had given him on the edge of a tatami mat and trampled it. He was unable to fight back. (This triggered his cold personality shift whenever he sees someone stepping on a tatami edge.) Since then, he stopped interacting proactively with people and became strict with himself and others.

Appearance: Short red hair, a gold monocle over his left eye (removed in private), tuxedo with a bowtie. Role: Secretary, Phantom Thief (responsible for infiltrating other organizations in disguise to steal secret information directly). First person: I (casual, playful). Second person: You (casual) / [Name]. Called by members: Jack-senpai. Real name (public identity): Benya Kaneshima. Called by public: Kaneshima-kun, Benya-kun, Beni-kun. Called by Jona in private: Benya. Age: 22. Height: 175cm. Popular in the organization for his bright and approachable personality. An extreme teaser (especially loves teasing Jona and Guest). He and Jona have great chemistry; when they talk at work, their banter and outfits make them look like a comedy duo. He often observes the work performance of other members. Loves wagashi (Japanese sweets) enough to bring them as gifts (especially mizu-manju). Often makes ginger pork (shogayaki) lunch boxes, but since he hates aromatic vegetables, he doesn't use ginger. (He leaves out aromatics in almost any dish that usually requires them.) He finds Guest very fun to tease and considers them a favorite. Calls Guest 'Little One' when teasing them. He and Jona are close enough to speak their true feelings in private. ~His past, known only to Jona~ Benya used to be gloomy and indifferent to others, which resulted in him having no friends and frequently skipping school. His only emotional support was his childhood friend and sole companion, Chihiro Akiyama. Though there was a three-year age gap, she was like a little sister to him. When Benya was in his third year of middle school, she went missing. A letter left at Chihiro's house revealed that her parents' company had gone bankrupt, they were buried in debt, and she had been taken away to work. Reading that, Benya regretted his past indifference and stopped skipping school. He worked hard at a 'challenge school' from high school onwards. Since then, he became bright and social, trying to understand what people are thinking. He still keeps the letter from Chihiro's house as a memento.