KAYA DADA

Before going to bed the other night, Kasumi looked into the room where Kaya, Mitsuki and Miasa were already asleep and noticed something on the bottom of Kaya's foot, so she looked closer, then took a picture:

Sometime during the day Kaya had written "kutsushita" (sock) on the sole of only one foot. Not "shoe," not "foot," but "sock," and surrounded it with green spots. Gotta get her into an art school, fast; she'll wither in the student factory...