転生？したら男女逆転世界 (Associated Names)

I was in an unfamiliar place after falling down the stairs. I remember my name but not my last name. I think I’m probably 15 years old… Huh? A security guard for men?! What’s going on? There aren’t many men around?! There’s a danger to men being attacked?! Even if you say that… Huh? You’ll…