Ryu ga Gotoku Kenzan! is an action-adventure video game published by Sega for the PlayStation 3. It is a jidaigeki-themed spin-off game in the Like a Dragon series. It was released exclusively in Japan on March 6, 2008.

Kenzan! is a dramatic telling of the life of the historical figure Miyamoto Musashi, who retired and adopted a new identity, but is later drawn into a new conflict where he must hunt down an imposter using his namesake.

After escaping from the political intrigue behind the battle of Sekigahara, Miyamoto Musashi, the strongest swordsman of Japan gave up his sword and identity and hid himself under the facade of Kiryuu Kazumanosuke, a hit man who owned an establishment called Tatsuya in Kyoto, Gion. Gion is an entertainment district where the rich and powerful buy sexual favors from the poor and powerless.

One day a girl, Haruka, came to Kiryuu with the job request “please kill Miyamoto Musashi for me.” and at her request Kiryuu journeyed to find his impostor and to reveal the secrets behind the battle of Sekigahara.

From Sekigahara, Gion to Funajima, bridging the gap between the legendary swordsman Miyamoto Musashi and the current hit man Kiryuu, the game takes its players through an epic plot filled with action, rivalry, sexual desire and political intrigue.