The manga centers on 35-year-old businessman Ryūichi Yamadera. Ryūichi travels around the country on business trips, and his sole pastime is trying different foods at local restaurants. He also ends up sleeping with the various married women he meets at the restaurants, while also being married himself.

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Edogawa Rampo Ijinkan is an adaptation of Edogawa Rampo's short stories.

1/ Wanderer in the Attic
2/ Human Chair
3/ Murder at D Slope
4/ The Magician

Let's take a good look at what happens in the shogun's bedchambers (and around them).