Masao is a dull virgin who always studies.The older brother, who is a real-life brother, brings his unrestrained and erotic sex friends, Yuki and Karen, into their house, and they have been having a lot of fun, greedying them.Although he doesn't suit his brother, he's very interested in things that are naughty.The next morning, despite his older brother going out to work part-time, Karen, who is still left with alcohol, and Yuki, a little devilish, approaches Masao's innocent body...
