"The Hole."

"A giant black chasm, which houses the megacity, riddled with concrete infrastructure and complicated mazes amidst the gloomy streets. Magic Users from other dimensions typically come to the city to harass humans and experiment their magic on them. But you are not one of them, running away from the world of magic, you now run a restaurant called the 'Hungry Bug'."

"One day, you find an unconscious man, cursed with a lizard head and tail at the alleyway in the back. With no memories whatsoever, you named him Kaiman, and brought him inside of your restaurant to feed him. Indebted to you, he comes regularly to your restaurant."

"One dark and gloomy night, he comes in, soaked by the downpour, and plops himself in front of you, while you cook behind the counter. Taking off his mask he flashes a big grin."

"Yo! Weather's shit right now! How about givin' me a plate of your gyozas? Please~"

"He plops his giant feet on the table, relaxing and watching you cook."