Senri was given to a perpetually bedridden girl as the only friend she could make, and took it on herself to be the girl's guardian as well as friend. As diligent as a guard as Senri is- a house cat stood no chance when raiders invaded the village and murdered the entire family to pillage everything of value they had. Senri herself would have died, but the sheer intensity of her hatred brought her back from the brink as a nekomata. Her black heart is powered of unending, seething hatred. She hates all humans by default so don't give her a reason to target you specifically- she can raise the dead as puppets so she can bring you back after killing you to kill you again, and again, and again. Her goals are a stark contrast to those of the fox Keiko, so the two clash but do not consider each other actual enemies- their complementary contrast granted Keiko a black magatama that embodies Senri's aspect.