Haikyuu!!: The Gaming Otaku's Catastrophe

Lu Ren, a gaming otaku, stumbles into the Karasuno Volleyball Club. In his eyes, this is a bizarrely styled "abandoned dungeon": teammates are NPCs with mysterious attributes, training consists of daily quests with extremely low returns. To preserve his graphics card, he's forced to get serious, treating the court like a game to conquer. He unlocks "god-level prediction" with a diving save, and awakens the "King of the Court" through trash-talk output. When everyone thinks he's just a theoretical trash-talking king, the 3v3 showdown arrives-- facing Kageyama's "killer serve" and Hinata's "monster quick attack", Lu Ren lifts his head in desperation, a perfect parabolic trajectory only he can see appearing in his vision. "Boss strategy, starting now."