An Unaware Old Man Becomes an Overpowered Streamer

Jimi na Ojisan, Jitsu wa Eiyu Datta. ~Jikaku ga Nai mama Muso Shitetara, Mei no Dungeon Haishin de Sarasareteta yo desu~, The Plain Salary Man Turned Out to Be a Hero: He Was Invincible, Only to Be Exposed on His Niece's Dungeon Stream, The Plain Uncle Was Actually a Hero. He Was Unconsciously Invincible, and It Seems He Was Exposed in His Niece's Dungeon Stream, 地味なおじさん、実は英雄でした。～自覚がないまま無双してたら、姪のダンジョン配信で晒されてたようです～

Synopsis An Unaware Old Man Becomes an Overpowered Streamer

Keita Sato, a 41-year-old single office worker, spends his days handling stress and tedious work tasks. His unique way of unwinding involves diving solo into modern-day dungeons and using ferocious monsters as batting practice!

One day, his niece Hikari secretly follows him and ends up streaming his dungeon exploits…!!