Yuki Miyoshi is just an ordinary office worker.
He lived with his girlfriend Chihiro Komanoma and lived a happy life.

One day, Yuki gets into a traffic accident and runs over his best friend, Takeya, with his car.
Fortunately, it wasn't anything serious, and they settled the matter by having Chihiro take care of him.
However, Takeya woos Chihiro and asks her out on a date while she is caring for him.

Yuki, who happened to witness the date, was knocked unconscious by a car during his state of shock.

When he woke up, he was in his home 6 months in the past.
To stop Chihiro's infidelity, Yuki relives those 6 months.

[From Steam]

Be warned that the artist of this work plagiarized the chara-design of Bubuzuke.