From underneath a cherry blossom tree, Tsukasa Kazami, a young man living in the year 2020, is suddenly transported 100 years into the past.

The Imperial Capital, Tokyo—a city brimming with vibrant culture, shining ideals, and dreams of a new age.

“Elementary, my dear Tsukasa.”

In this bustling metropolis, a strange British woman known as the Chief runs a private detective agency by herself.
Alongside the habitually penniless Chief, Tsukasa finds himself wrapped up in a variety of quirky investigations.

Will Tsukasa’s branching fate lead him back to the present, or will he remain trapped in the past?

Spanning the course of a century—the curtain rises on this sakura-scented retro mystery!