a Neptunia story about adventures

You are a security of the ark and you would protect it with your life, but what happens when you failed to protect it and is sent to another dimension? And the girls there take interest in you?

Akimoto Kazuma who lives as an ordinary person enjoyed his daily life with no memories of his previous life during a war which cause his master to disappear from the world, one day while he watches his favorite animes, he received an overwhelming powers and ends up being transported to the world of HyperDimension Neptunia, where he meets IF, Compa and Nepgear, After hearing the story of what happened in their world three years ago, Akimoto embark on an adventure to save Gamindustri from destruction.