Shōyō Hinata began playing volleyball after seeing the “small giants” who played the sport when he was in elementary school. He suffers a crushing defeat in his first and last tournament in middle school at the hands of his rival Tobio Kageyama. So, Hinata joins Kurasuno High School’s volleyball team, vowing revenge against Kageyama. However, Kageyama is also on Kurasuno’s team. The former rivals form a legendary combo with Hinata’s mobility and Kageyama’s precision ball-handling. Together, they take on the local tournaments and vow to meet Kurasuno’s fated rival school in the nationals.

In the year 2138, virtual reality gaming is booming. Yggdrasil, a popular online game is quietly shut down one day. However, one player named Momonga decides to not log out. Momonga is then transformed into the image of a skeleton as “the most powerful wizard.” The world continues to change, with non-player characters (NPCs) beginning to feel emotion. Having no parents, friends, or place in society, this ordinary young man Momonga then strives to take over the new world the game has become.