Shelter from the Rain

Apart from the others, Jubei finds himself poisoned in battle with Nenmu, a ninja who can use the bodies of people. Caught in a rainstorm, with the help of a woman and her young son, Jubei slowly recuperates from the poison. But with Nenmu's ability to manipulate anybody, who can tell a friend from the enemy? Will Jubei's newfound allies turn against him?

Synopsis excerpt via Kitsu.