Kai and his respected Chief won a year-end planning contest

and obtained a one-week invitation to a hot spring inn.

However, his Chief was busy preparing Christmas presents

for his daughters and left Kai alone.

Mei, who had been enduring a long period of sexlessness,

set her sights on the virgin Kai and forced him to go.

Kai and Mei, who was in place of his Chief, went to the hot spring inn together

and spent seven days in the same room.

At the hot spring inn, the two met a young couple,

a mother and her child, and the old men who always drink.

"--I'll never give my virginity to a three-dimensional woman...!"

Unable to escape due to heavy snowfall, can Kai withstand Mei's onslaught and protect his virginity...

Or will Kai and Mei end up in a different relationship...other than sexual relationship?