The heroine, Aoyama Mako, is a full-time housewife who is troubled by her husband Keisuke's ED-related lifestyle. The company Keisuke works for has business with foreign countries, so the president of the company also acts as a host for international students who come to Japan for a homestay. However, the president's wife suddenly becomes ill in hospital and she is left in charge of Billy Wilson, a foreign exchange student she had planned to take care of.

One day, they get into trouble and end up taking a bath together and she becomes interested in the size of Billy's crotch. He said he had held a woman outside, but even in that state, he had impressive vigor. As she serves him, she crosses the line of lust, combined with the frustration from a long life with no sex.

Frustration relieved by Billy. But Billy's demands don't stop. He beat the insatiable pleasure into you.

Will Mako be able to escape from her days of fulfilling pleasure?