While attempting to solve the mystery of a stolen jewel, Seikei, a merchant's son who longs to be a samurai, joins a group of kabuki actors in eighteenth-century Japan.
In eighteenth-century Japan, young Seikei becomes involved with a ninja as he helps Judge Ooka, his foster father, investigate the murder of a samurai.
Samurai Seikei and Judge Ooka, his foster-father, seek seven men who have seven maps on their backs in order to locate a cache of dangerous weapons before they fall into the wrong hands.
Returning home to investigate the possible connection of his family's tea shop with smugglers, Seikei, now a samauri in eighteenth-century Japan, becomes involved in murder at a local puppet theater and saving the life of his sister's accused boyfriend.
In eighteenth-century Japan, fourteen-year-old Seikei, a merchant's son in training to be a samurai, helps his patron investigate a series of murders and arson in the capital city of Edo, each of which is associated in some way with a popular geisha.