Haikyuu!!: The Disaster of Gamers

Lu Ren, a gamer, accidentally stumbles into the Karasuno Volleyball Club. In his eyes, this is a peculiarly designed "abandoned dungeon": his teammates are NPCs with mysterious attributes, and training is a daily task with extremely low reward.
To protect his graphics card, he was forced to work, treating the basketball court like a game. He unlocked "god-level prediction" with a diving save and awakened the "king of the court" with his verbal sparring.
Just when everyone thought he was a mere armchair theorist, the 3v3 duel began—
Faced with Kageyama's "killer serve" and Hinata's "monster fast attack", Lu Ren raised his head in desperation, and a perfect parabola appeared in his field of vision that only he could see.
"Boss Strategy Guide, Let's Begin."