An Unaware Old Man Becomes an Overpowered StreamerThe plain uncle was actually a hero. He was unconsciously invincible, and it seems he was exposed in his niece's dungeon stream

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...!!