Mistress Hoshina develops masochistic men as toys and ships them to many Mistresses. Because masochistic toys used in everyday life must be durable to prevent breakdowns and deterioration, a number of rigorous endurance tests are conducted. Only masochistic toys that meet endurance test standards are shipped as products, and those that do not meet the standards are discarded. Today, the endurance test of one masochistic man began again for the development of a new product.

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