I just finished my first run of it, is there anything different about the 2nd run? like is there a turn limit and stuff
Second game onward allows you to start alternative routes, and contain alternative choices for some scenario, e.g: when you conquer Hara, assuming you have enough NP, you can have Akihime as a Miko/Healer unit; or you can duel and recruit Inukai (this specifically is canon); or save and character clear Yukihime (also canon).
You can also pick some bonus, like the Operation Permit set, +5 NP, +1 Action or +10k Gold. Also treasures you got from prior runs can also be choose here
There are also bonus units, like the onmyouji Elina or the Samurai Morita Ai. You can also obtain house-specific units, like if you conquered Uesugi and recruited both Ai and Kenshin, you can have them as your starter units, with the caveat that Uesugi will be at war with you right away
How to start each route (all can be setup within one run):
Official History (aka True, you already start this when you start first run):
Conquer or vassal 5 houses with gourds. Since Oda will break first anyway, in reality you only needs to deal with 4 houses
Isoroku:
Conquer Ashikaga and recruited Isoroku. Then raise her affection and see her first H-scene. When Kouhime goes missing, choose "Search for Kou, but..."
Kenshin:
To do this,
note that the third gourd-breaking event must happen after Turn 22. The third house is usually Uesugi anyway, so remember to try and conquer them after Turn 22. Then ofc, recruit both Kenshin and Ai. Raise Kenshin's affection to Trust then see her deploying event where she eat her riceballs. After the event where Xavier recieves the Emperor Headband, start the picnic event at Maso
Ran:
You must recruit Ran and wait for Souun to go to Viper Oil Field's dungeon. Do scout often, cuz if you saw Ran with the move "Summon Suzaku", you cannot capture her and you'll lose anyway. One she lost that move, capture her, wait for Souun to disappear, then conquer Houjou and recruit Ran, see her first event (basically any of her purple events), then go to Viper Oil Field's dungeon and clear it.
You must not be already in a route (aka already breaking 5 gourds or enter any heroine routes) piror to this, so this should be your third house on your gourd-breaking list
Monkeyslayer:
Choose "Enable Killing Toukichirou" in "Clan Character Bonus". Once Suzume joins you (around Turn 7), choose the "Kill Toukichirou" event, and welcome to Monkeyslayer. This route is effectively a sandbox mode where you can grind for points and watch obscure events
Archfiend (Bad Ending,
unwinnable):
In any route, either do not search for Hirami Lemons (aka don't go into Mikan's dungeon) or do not search for Miki shen she goes missing. You have to rely on Operation Permits for this one if you want to take all the provinces during this route
Optimized house conquering order:
Hara->Ashikaga->Any house nearby that doesn't have gourds, including: Tanegashima, Tokugawa, Imagawa, Miko Union or Azai-Asakura. Leave Azai-Asakura for last though->Kenshin (conquering after Turn 22 and have to conquer after the coup has happened within 5 turns)->Houjou