The Conspirator is Masako Tale 8 of 9, an Act 2 side tale in the Kushi Grasslands where Masako turns her suspicion on Junshin. It ends with a duel against Masako herself and rewards the Charm of Dual Destruction II and the Seasons of War Armor Dye.
Part 8 of 10 in Masako's Tales
Part 28 of 66 in Tales of Tsushima
Masako has worked through her list, but whoever planned the attack is still unknown. You find her questioning monks. She has found a letter in handwriting like the ringleader's, asking where she is in exchange for supplies, and she thinks Junshin wrote it. Jin wants to talk to him calmly. Follow Masako, fight Mongols along the way, then get into Red Leaf Temple and save Junshin from them.
Talk to Masako, a monk, then Masako again. Ride with her and fight two groups of Mongols on the way. Get into Red Leaf Temple and rescue Junshin. Duel Masako. Beat the Mongol reinforcements and talk to her. Track Junshin and talk to him.
The duel with Masako is a one-on-one fight, and more Mongols arrive right after it, so go in with your health topped up.
Once Junshin is safe, Masako tries to kill him anyway, so Jin sends him running and duels her to stop it. After the fight Jin warns her never to turn her blade on him again. When you catch up with Junshin, he says he never worked for the plotters: the letter came from a Lady Hana. Masako realizes the mastermind is her own sister.
The Family Man
The Family Man is Masako Tale 6 of 9, an Act 2 side tale that starts at Omi Monastery in Kubara. You talk the monk Junshin into revealing where a former Adachi retainer lives, then go after him. It rewards the Charm of Ferocity and 2 Silk.
The Thief
The Thief is Masako Tale 7 of 9, an Act 2 side tale near Kawamata Village in Kushi. You track Mai, a former Adachi servant who looted the estate after the massacre, and recover the stolen heirlooms. It rewards the Charm of Bludgeoning and 2 Silk.
The Traitor
The Traitor is Masako Tale 4 of 9 and the last Act 1 part of her hunt, set in Ariake. You use a supply map and a monk's help to corner Sadao at a lighthouse. It rewards the Charm of Incineration, the Warrior's Bounty Dye Kit and 2 Silk.
Image: Sucker Punch Productions / PlayStationThe Tale of Lady Masako
The Tale of Lady Masako is the Act 1 story tale where you recruit Masako Adachi after her clan is wiped out. It rewards the Samurai Clan Armor and is also Masako Tale 1 of 9, opening her side storyline.