My Time-Traveling Daughter Ruined My Peaceful Extra Life

Becoming an extra character in a harem game world should have been an easy task. Especially when the original Protagonist of this world is highly competent at saving the world and charming the heroines. Perfect. I didn't need to step in. I even gladly ignored the System Quests until that chatty entity went on strike and shut down for good.

For nearly three years at the academy, I successfully managed to become the "masterpiece" of a peaceful background character.

However, just as graduation was finally within reach and everything felt safe... a five-year-old little girl suddenly barged into my quiet life.

"Father! You have to save Mother right now!"

Coming from a ruined future, my little daughter brought a warning of the apocalypse. 

To make matters worse, who exactly is the "Mother" she is referring to among the line-up of heroines at this academy?!

This is the story of an extra character who is forced to retire from his peaceful life to become a father—and an accidental savior.