Aruna Kazuto, an ordinary high school boy, spends his days immersed in his favorite online game. One day, he discovers the true identity of his in-game friend, with whom he even got married in the game. It turns out to be Mizuki Rinka, a cool idol from his class. As Rinka starts acting like a wife in real life too, Kazuto finds himself in a whirlwind of a daily life.