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 Please be advised that the PDF is outdated now, but still contains information for the whole game.
The chapter starts off with Ryoma in his room in Terada Inn with a list of names of Tennen Rishin users - he's been marking off the names of those who he knows is not the masked man he's looking for. Oryo comes up to the room and tells him she's prepared some food for him.
After she leaves, Ryoma says he should head over to the HQ.
When you enter the Shinsengumi HQ, Okita calls out to Ryoma. He says he has something pretty cool to tell him - and only him. He tells Ryoma to meet him at the storehouse, so the two can talk alone.
[1]
Go to the storehouse. Okita asks Ryoma if he's heard the name "Sengoku Toranojo". He tells Ryoma he's one of the leading drapers and he has a mansion in Fushimi. Apparently there are loads of Ishin-Shishi hiding out at his mansion and they have to go and clamp down on them. Ryoma asks why he could tell only him - Ryoma has not done his fair share of good deeds, that's what the Vice Commander says, so Okita is asking Ryoma to go along with him. Ryoma thinks he's up to something, after all he could ask Nagakura or Todo to do this with him - Okita says Ryoma entered the Shinsengumi to track down the Tennen Rishin style, so he's not going to fight over their shares (of the payment for their work). He tells Ryoma to head over to Sengoku's residence at night when he is ready.
After talking with Okita, head back to Ryoma's room in Terada Inn and sleep in the bed (choose the MIDDLE OPTION to sleep until night).
[1]
Go near here and Okita speaks to Ryoma. Apparently the Ishin-Shishi have been drinking, completely unaware that they're going to be raided. Choose the BOTTOM OPTION to tell Okita you are ready for the raid. This is another long fight sequence, so bring health items if you think you'll need them.
As usual, yellow dots indicate items on the ground you can pick up.
Make your way to the door at the top right of the screen.
[1]
When you get to this area, there is a long passageway and at the end Sengoku is using a machine gun. Use the cover here and fire from a distance (Pistol fighting style).
After he runs off and you run further down the passageway, some guys show up behind Ryoma and Ryoma says he should use the machine gun to take them out. You don't have to use the machine gun if you don't want to, but the option is there.
[2]
When you get into this room, you fight 2 armoured warriors. If you picked up the Acid Bullets sat around just outside the room (the yellow dots on the map above), use them because they destroy(/"melt") armour.
After beating the warriors, Ryoma tells Sengoku he's not going to kill him, but he is going to bring him back to the HQ. Then Okita appears and Sengoku says "You're late, Okita". Ryoma asks what's going on and Okita tells him Sengoku was helping out with their plan - he's the guy who got the Ishin-Shishi drunk, so they'd be easier to kill. Turns out he made a deal with Okita and set up the Ishin-Shishi in the hope that he could get in with the Shogunate. Sengoku says the Ishin-Shishi weren't the only ones they set up - they also set up Ryoma. He then asks Okita if he can tell him about it and "why he had to lure Hajime out here", but Okita walks over to him, saying "You really never stop talking...", and kills him. Okita says he knows about Ryoma's true identity - apparently he knew it the moment he saw him at the try-outs. He says he knows Ryoma is here looking for the masked man and tells Ryoma that he is that masked man! He says he still remembers the feeling of killing Yoshida Toyo to this day. He says no one will disturb them there and the two of them can go all out until one of them is dead, "Show me how much stronger you've become since a year ago, Ryoma!".
After Ryoma wins, he pins Okita to the ground and Okita tells him he's become strong. He tells Ryoma to finish him off, then his revenge will be complete. However, Ryoma tells Okita he's not the masked man who killed Yoshida.
Ryoma explains that the masked man's Tennen Rishin was of a pure style, whereas Okita mixes in his own short sword techniques. Ryoma asks why he lied about being the masked man and Okita tells him he just wanted a geniune full-on fight against him, with neither holding back. Then Ryoma asks how Okita knows his true identity, since he's not the masked man, and Okita reveals that he was there when Ryoma met with Kondo. Okita tells Ryoma not to worry, because he won't tell anyone about his identity. Ryoma then wonders aloud who the hell the masked man was then - it's not Okita, Nagakura or Kondo, after all. The only 3 Tennen Rishin users left are Hijikata, Todo and Inoue, so he says it must be one of them.
The two of them head back towards the Shinsengumi HQ, but then Oryo runs up to Ryoma with a letter from Nakaoka. Ryoma can't believe what he's reading - "Kyodai (Takechi)... is dead!?".
When you complete this chapter, you get the "Story Clear #4" trophy.
