Title: Tantei Jinguuji Saburou Detective Story: Inishie no Kioku
Original title: 探偵 神宮寺三郎DS いにしえの記憶
Aliases: The Ancient Memory
Links: Wikipedia
Developer: WorkJam
Publishers: Arc System Works
Aksys Games

A man named Ken Krause (Kenichiro Kosugi) has somehow gotten himself mixed up with some gangsters,
and after being threatened he is forced to carry out some questionable tasks by them.
He also finds out that these people have targetted Jake Hunter. Who are these people, and what are their true intentions?

This is a story exclusive to the DS and doesn't have a number assigned to it.
As a bonus this release also includes previous Jake Hunter games (1 to 5)
and six chibi style minigames where Jake has to deduce a culprit by questioning suspects.