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Haruka, who works at a lingerie design company, is in charge of developing underwear that "supports women who can be bold," but it is a difficult task for Haruka, who has no experience with men, and struggles. Meanwhile, a male employee with an erection inserts his huge penis into Haruka's big-ass panties while drunk... However, since that day, the project has been progressing smoothly, and Haruka, who has been indulging in sex, thinks "I need to do something more erotic and understand the appeal of underwear," and even the Inran body is co-developed...