Mob destroys scenario in gal game

This is your typical into story of a office worker, however instead of death by overwork, it's by gaming crazy amount on his off time, and saying i don't need sleep. He is sent into a gal game world he played multiple times just before his death. There is a big problem though for this mob character not in the game storyline, the town he lives in is first to be destroyed by monsters.

Will he be able to save his family and town, how will he change the scenario in the game in future events, will the heroines still fall for the game lead or will it go haywire. I read the authors previous work that has just finished this week, was a lot of fun and I hope the same will be true for this one.