The favorite pastime of Kotaro, a single man in his thirties, is drinking alcohol.
One day, a female knight named Maribel from another world suddenly appears in the apartment next door.
When Kotaro cooks a meal for the hungry Maribel, she insists on repaying him for his kindness.
So Kotaro makes a simple request:
“I want you to become my drinking buddy.”
But then…!?