An old man is pressured by his work into quitting, and is unemployed.
Living an uneventful life, the only enjoyment in his day now consisted of masturbating.
One day, he saw a girl in school uniform waiting out the rain in a convenient store,
despite it being midnight.

The desperate man decided to use her to satisfy his urges.
After offering an umbrella and being kind to the girl with nowhere to go,
she ends up coming to his place.
Her name is Tomomi, and ran away from home after a falling out with her parents.

He then violates the wet Tomomi who was resting at his place.
Knowing its too late to let her go, he decides to keep her captive there.

The jobless old man stays with Tomomi-chan all day,
and constantly violates her with unbearable urges, turning her into his sex pet.

[From DLsite English]