Jimi na Ojisan, Jitsu wa Eiyu deshita.: Jikaku ga Nai Mama Muso Shitetara, Mei no Dungeon Haishin de Sarasareteta You desu

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…!!