Darling wa Nakimushi Gaikokujin

After graduating from high school in the United States, Eric finally returns to Japan to see his childhood friend, Nao. It has been 13 years since he left. Nao is growing up and must be beautiful now. Eric has been secretly longing for her. But when he calls at Nao's house, the person who answers the door is a bearded, frowning man who is wearing nothing but a pair of underpants. To Eric's astonishment, he is Nao! Nao is a man! Eric was so young at the time that he thought Nao was a girl and he has been mistaken for such a long time. But same as before, Nao is very kind and Eric still feels that he likes him. Nao suggests to Eric that he stays in his house instead of using hotels during his whole stay in Japan. Eric is happy to stay but in the middle of the night, woken by noises, he finds Nao is taking a male customer and having sex! Eric is so shocked and next morning, he offers Nao a credit card and says, "Just don't have sex with strangers anymore..."

(Source: Takeshobo)