Konoha figures out the trick to time travel, and succeeds in going back to the past for the third time. But the winds of change are blowing in 1999, and Alcohol Soft is caught in the eye of the storm!

Alcohol Soft suddenly finds itself saddled with one billion yen of debt. It's up to Konoha with her future know-how of bishojo games, along with Mamoru's technical expertise, to save the day!