After Yak, the elder brother returned to his hometown, he must find a way to save his younger sister from a bizarre illness that is causing her to behave differently.After Yak, the elder brother returned to his hometown, he must find a way to save his younger sister from a bizarre illness that is causing her to behave differently.After Yak, the elder brother returned to his hometown, he must find a way to save his younger sister from a bizarre illness that is causing her to behave differently.