Futari Bocchi No Shokutaku

One day, Natsuo a part-timer picked up a young man, Keisuke in front of his house. He began to look after the man since becoming attracted to him eating so deliciously. They have sex as thanks for the meal. They don't even know each other's names. It was a strange relationship -. But Keisuke suddenly proposes "Let's learn about each other one step at a time each day!?"