Kajiwara is a fisherman and former Adachi retainer who recruited the killers for the massacre. Masako sacked him for beating his wife and daughter. Junshin, who thinks he is a gentle man, reluctantly points you to his beach hut.
Mongols attack his hut before you arrive. After you clear them, you find his family dead inside and track him to a cliff. He blames the Mongols, but Jin and Masako work out that he killed his wife and daughter himself.
He refuses to name who hired him and rants about how Masako ruined his life, and Masako kills him.
Junshin
Junshin is a kind monk who turns the Golden Temple into a refuge and runs survivor camps across Ariake. He is the man Jin and Masako keep going to for leads in Masako's Tales, though he worries about her thirst for revenge.
Masako Adachi
Lady Masako Adachi is the only survivor of Clan Adachi and one of Jin's allies. Her husband and sons die in the Mongol landing and the rest of her family is murdered the same night. Her side storyline, Masako's Tales, has you hunting the people behind that massacre.