To most teenage gamers, the idea of teaming up with their mother in an online game appears highly unlikely and discomforting. However, Masato Oosuki discovers himself in this precise predicament. Upon finishing an apparently insignificant survey, Masato is thrust into the realm of a fantasy MMORPG, joined by his mother Mamako! Adding to the unexpectedness, it turns out Mamako wields immense power as a two-hit multi-target swordswoman! Despite initial tension, they set out to find fellow players to join their party, meeting the merchant Porta and sage Wise, embarking on a journey to conquer the game.