The true identity of his first love was a wolf girl. Mochizuki is a boy who reunites with his first love, Kawuru, when he enters high school. Unlike in the past when she was naughty and dominant, Kawaru has grown into a graceful and beautiful girl, but her sense of distance remains the same as before. Immediately after entering the school, Mochizuki is put off by the current that has become the school's most popular river, but after a certain incident, he learns her "secret"...!? An interspecies love comedy between a naive boy and a werewolf girl.