The erotic game by Cosmos was released after the release of these 3 OVAs.<br>
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Milky-chan is tasked with caring for her shut-in male friend while his mother is out of town. Feeling she's the only one who really understands him anyway, she accepts the job happily. When he won't come down for lunch, though, she goes up to his room and catches him masturbating to some hentai. Then she finds a book about having sex with women, so she volunteers herself so he can learn and experience the real thing – but it's not complete until she puts on a costume!<br>
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(Source: H-Moe)

After former motorcycle gang leader Yajima Kintaro saves the life of the Yamato Construction Company's CEO, he is offered a job working for the company. However, when it becomes apparent that a corrupt faction of the company is trying to gain full control, Kintaro's moral and physical strengths become more useful than the CEO ever imagined. As he works his way up the career ladder Kintaro is forced to deal with many problems, from confrontations with Yakuza bosses to preventing the collapse of a tunnel. But can an uneducated and rowdy person really make it as a salaryman?