After dying a hilarious and pathetic death on his way back from buying a game, high school student Kazuma Satou finds himself sitting before an obnoxious goddess named Aqua. She provides the NEET with two options: continue on to heaven or reincarnate in every gamer's dream; a real fantasy world! Choosing to start a new life, Kazuma is tasked with defeating the Demon King who is terrorizing the world of KonoSuba. 

This takes place before you, Aqua and Kazuma meet Megumin and Darkness.