My Master Went Crazy, So I Trained My Junior Sister Until She Did Too

If you don't go mad, you won't survive. Xu Yunfeng taught his master to sever the Three Corpses, and his master grew four heads. He taught his junior sister to sever the Three Corpses, and she split into four: One kicked him; one stroked his face; one bit him. And his junior sister went completely mad... His master and junior sister had both gone mad. Xu Yunfeng couldn't stay sane either...