Rikka, Chiyo, Sekine and Tsubasa seem like regular middle-school girls, but t...
4-nin wa Sorezore Uso wo Tsuku
Season 1 Episode 10: Atami
The four friends go on a trip to Atami, a resort area known for its hot springs and traditional wooden dolls. However, it also featured an eagle-eyed local who could accurately determine Tsubasa's gender.