Kokomi Shiina, a girl on the rhythmic gymnastics team, heads to school as usual, tired. During practice, she meets a girl named Chloe Lemaire. Chloe drops a picture as she's leaving and Kokomi knows it had to be important to her, so she goes around the school looking for her, but can't seem to find the girl in question...
Erena-san is just impossible.
Erena-san ist einfach so.
Erena-san no cambia nunca.
Erena-san no cambia nunca.
Elena est vraiment embêtante.
Erena-san è proprio una 
persona problematica.
A Erena-san não tem jeito.