Season 1·Underground Empire
An adventure mystery that begins in a secret base.
Story
A mysterious old map is discovered inside a secret base. Ken, Taku, Sho, and Haru step into an underground facility filled with hidden clues.
What awaits them is a lost treasure and a secret buried for sixty years.
Case File
Target: The Underground Empire
Search party: 4
Status: In progress
Characters
KEN
Commander-in-Chief of the Treasure Sleuths.
The team's leader, responsible for bringing everyone together and leading investigations from their secret base.
Pursuing the mystery of lost treasures, he embarks on adventures alongside his friends.
TAKU
Chief Strategist of the Treasure Sleuths.
A sharp thinker who excels at planning operations and conducting investigations.
No matter how puzzling the mystery, he analyzes it calmly and supports the team's missions.
SHO
Chief Scout of the Treasure Sleuths.
Curious, energetic, and always ready for action.
The first to charge into dangerous places, he leads the way for the team.
HARU
Chief Intelligence Officer of the Treasure Sleuths.
Skilled at gathering information, he brought the classified clue that sparked this adventure.
He also loves eating more than anything else.
Staff
Original Story / Planning / Screenplay / Director / Production Direction / Editing / App Development
Nosuke
Junnosuke Nakamura
Production
APPKEY LLC.
App
Launching Sunday, June 14, 2026
Free to download
The treasure discovery app from the story is available as a real, free app. Use AI to identify antiques, vintage items, collectibles, and hidden gems.
Discover
FAQ
