This is a heroic fantasy story of a great military strategist who has been branded incompetent. In a time period where humans fight with guns and modern weapons, the fantasy tribes have been destroyed by their overwhelming power-- A human boy raised in a elven village - Gardy - broke the village's law and has been exiled. Thus he went to the Intrasia territory which is governed by the gold princess Florin. (Source: MF Bunko J)

A quiet, moonless night. Tsukishiro Michiru has a dream of being lost inside a mysterious old castle. She meets with five jewels that had taken the form of attractive men. She is ordered by the castle's master. "Choose the jewel you think suits you the best by the night of the next full moon". However, the jewels only have exceedingly harsh personalities that would be called "cruel", "beastly", "sadistic", "scheming", or "yandere"! As though being guided by something, in the real world she then meets five men that look the same as the jewels she met in the dream world. But completely different from the jewels, these men are refreshing and wonderful. Are they the same person or a different person? If they are the same person, which one is their true self? While spending the day with the gentle and refreshing men and the nights with the extreme and ill-mannered men, the curtain is opening on days filled with a puzzling "gap"!

A parody of classic detective novel tropes. Unlike the main manga this story is told from Kagami's point of view.