Yumiko ordinary full-time housewife who lives peacefully. However by fault of husband's impotence, a strong frustration was causing to be smoldered even though it is unawareness.

One day Yumiko sees the large penis that doesn't suit the face of a pure heart boy Masao that lives nearly by a trifling having an accident... It becomes horny severely and the binding reason comes off, the hard large penis is jumped into the fray though it feels shy!

A husband of Yumiko comes home suddenly there, but the two who did the brake not work continue the act while hiding. Finally the sound reaches even the husband of sexual intercourse!

Afterwards, good thing a super-natural airhead, super-shortsightedness silly husband as for no awareness, two repeat the sexual intercourse of the thrill perfect score. To cancel a longtime frustration, yumiko the act is intensified for harder stimulation.

And "Ultimate thrill play" which she reaches at the end...!?