Tanaka no Isekai Nariagari

Tanaka, a 32-year-old man, gets caught up as a bystander while the hero is summoned to another world. His stats are mediocre and skills are unremarkable, but Tanaka remains positive and decides to have fun in this new world, saying, "Since I'm here, I want to use magic!" What will he encounter on his journey while meeting reliable companions?!