The protagonist (name customizable) is a salaryman working in a provincial city.
One day, after a work-related mishap, he drowns his sorrows in alcohol and passes out on the street.
When he wakes up, he finds himself in an unfamiliar living room, being cared for by the heroine, Uesaka Shiori.
Shiori had taken pity on him after finding him passed out on the street and brought him home.
Touched by her kindness, the protagonist begins to pursue her. Shiori doesn't seem entirely opposed, but...
And so begins a sweet, slightly unconventional romance with an older girlfriend.

[Translated from dlsite]