The fourth installment of this niche practical guide to choking techniques. This film meticulously captures young women fainting, demonstrating ultimate hands-on techniques. It comprehensively covers everything from basic to forbidden moves, thoroughly explaining the effects of strangulation on the brain, blood flow interruption, eye-rolling unconscious states, and physical changes and reactions. It also delves into the psychological and mental shifts during awakening. Akari Niimura, a certified judo practitioner, displays precise technique and knowledge of emergency care. When choked out, she cleanly loses consciousness, consistently rolling her eyes back with intense, grotesque facial reactions. Though indifferent and down-to-earth about her appearance, she finds pleasure in being choked repeatedly, suddenly awakening as a masochist and causing chaos on set. Yua Nanami has about three years of experience; while her technique is questionable, she tends to panic when administering first aid to unconscious subjects, often disrupting filming. When choked, she opens her eyes wide and screams loudly before passing out. The two female athletes practice these techniques with proper emergency care to ensure they don't die. Do not attempt this under any circumstances.