Bloodletting is an Iki Island side tale in Gonoura that follows Troubled Waters. You and Sugi set up a fake betrayal so Yamaneko's raiders and their Mongol allies turn on each other.
Part 9 of 16 in Tales of Iki
Sugi used to ride with Yamaneko's crew. Her idea is to slip onto his ship and use its hwacha on the Mongols while you attack their meeting on the beach. If the Mongols think the raiders betrayed them, the alliance falls apart.
Start at the abandoned fishing village where Sugi is waiting, and free a prisoner there before talking things over. Next, quietly deal with the raider lookouts. Wait for the right moment, scout the meeting on the beach, then give Sugi the signal to open fire from the ship. Kill whatever is left of both groups, meet back up with Sugi and look over the wreckage.
Sugi admits Yamaneko is her brother. She still decides he has to be stopped, because he is trading slaves to the Mongols in return for protection.
Troubled Waters
Troubled Waters is an Iki Island side tale in Gonoura, north of Zasho Bay. A raider crew has teamed up with the Mongols and is using hwacha against locals, and you go looking for a woman named Sugi who can help stop them.
A Helping Hand
A Helping Hand is an Iki Island side tale where you keep running into Emotaro, a man rebuilding his home alone after the Mongols burned it. Help him four times and you get the Charm of Iron Grip.
A Mother's Law
A Mother's Law is an Iki Island side tale given by the raider leader Fune at Fune's Refuge in Yahata. It opens after Epilogue: Last Words and has you help her hit a Mongol supply ship.
A Raider's Return
A Raider's Return is an Iki Island tale where Tenzo takes Jin to meet his crew of raiders. It's how you first link up with the raiders, a group that normally has no love for samurai, in the fight against the Eagle Tribe.