Ryu ga Gotoku Ishin (released in Japan in February 2014) is a spin-off game set at the end of the Edo period of Japanese history (known as the Bakumatsu period), a period when the Tokugawa Shogunate came to an end and imperial rule was restored (Meiji Restoration).
Sakamoto Ryoma is living undercover, with a false identity, as "Saito Hajime" in Kyoto. One year earlier, on the eve of the coup d'état of Tosa, Ryoma's foster father, the man who raised him, was murdered before his eyes. The only lead he had to discover who the killer was is that he used the Tennen Rishin style of fighting. This is a style used by the Shinsengumi, so Ryoma infiltrates their ranks, becoming captain of the 3rd Shinsengumi unit, in attempt to find the killer.
Big thanks to Kevin Debrabandere for creating a PDF for the entire Ishin guide. You can download the PDF version of the guide here. Please be advised that the PDF is outdated now, but still contains information for the whole game.
You can participate in the arena in Mukurogai any time after arriving there in Chapter 2.
Talk to the guy at reception and he'll register you for the arena. Talk to him again to bring up the arena menu.
The top option fights in the arena
The 2nd option is the gift exchange (you can exchange the "Fighting Orbs" you gain in the arena here for items)
The 3rd option shows you a screen of the arena opponents (including your win/loss record against them and the items you can get from them)
The 4th option shows you the rules
The 5th option exits out of the screen
When you select to fight in the arena, you get 2 options: You can either fight in a knockout tournament (like the tournaments in previous games in the series) or you can fight in the "100 Man Killing" mode (where you continuously fight enemies until you either lose all your health or beat 100 guys). In this mode, the number of enemies you defeat determines your reward:
In addition, you can get a multiplier bonus which boosts the amount of fighting orbs you receive. The multiplier size depends on how many "points" you have when you finish this mode.
Points Needed [Multiplier] - 90+ [x3] / 75-89 [x2] / 60-69 [x1.5] / 50-59 [x1.2] / 49 or less [x1]
Below is information on how you get points:
Completion Time - 7:01 or longer [10 points] / 6:01-7:00 [15 points] / 6:00 or under [25 points]
Remaining Health - 69% or less [10 points] / 70-79% [15 points] / 80% or more [25 points]
Biggest Combo - 15+ [5 points] / 20+ [10 points] / 30+ [15 points] / 50+ [25 points]
Enemies Defeated - 15 or less [5 points] / 16-30 [10 points] / 31-50 [15 points] / 51 or more [25 points]
You sometimes get 1 of 2 items when you defeat an enemy in the knockout tournament (see tables below).
Below are the tournaments you can fight in (in the order they appear on the list in-game) and the enemies in those tournaments:
Prize Money: 300 Mon
Fighting Orbs: 50
Prize Money: 300 Mon
Fighting Orbs: 50
Prize Money: 1000 Mon
Fighting Orbs: 200
Prize Money: 2500 Mon
Fighting Orbs: 100
Prize Money: 2000 Mon
Fighting Orbs: 200
Prize Money: 2000 Mon
Fighting Orbs: 200
Prize Money: 5000 Mon
Fighting Orbs: 300
