Tōdō Ryūnosuke Tantei Nikki: Aen no Kōfune - Sōma-tei Renzoku Satsujin Jiken

The fourth entry in the 1920 series follows detective Ryūnosuke Tōdō as he solves the Soma manor serial murder case. In this entry, he's called following the discovery of the body of a doctor in the basement of a mansion built on a cliff. As he investigates that mystery, further mysteries emerge and more murders take place.

This is a menu-driven adventure game with a strong focus on the time period and the specific locale in which it takes place. Like the previous game, Ruri-iro no Suiren, this is a brand-new entry for mobile phones and not a port of a classic computer game.