Throat-fuck volunteering is the act of volunteering to offer one's throat for free, with the aim of creating a society where people can live together and help each other as human beings. Shizuku visits the volunteer center with the desire to be useful to society, to be someone's hope, to provide motivation for life, to be a part of salvation for many people, and to bring happiness to everyone. However, she is deceived by the center's director, imprisoned, and subjected to throat-rape. She resists strongly at first, but gradually becomes submissive. Hard-core deep-throat volunteering, deep-throat training with relief supplies and adult toys. She is forced to drink a man's urine through an enema, and then a penis is thrust deep into her throat and urinates directly. From there, she is deep-throated, spits out the urine, and then drinks it again in a recycling deep-throat. She is then forced to not only urinate with the man, but also with her own urine, which is then collected and drunk in a self-drinking recycling. From a throat-fuck threesome, she performs three consecutive deep-throat services on men who are underprivileged. Shizuku's throat is used as much as he wants. Shizuku's pure feelings are trampled on, but her true nature is that she is a born masochist who wants to be messed with, to be an outlet for men's desires, and to be useful for sexual relief.