Shiroyama-san to kuroi kaban

is a Japanese light novel series written by Suzu Suzuki, with illustrations by Kokonoka. The series began publication on March 10, 2009 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Miss Shiroyama, a mysterious and cute classmate. There was a secret in the black bag she had with her skin. "Don't touch Kyuei, Ningen !!"

"Please tell me you didn't see it! Otherwise, I ──!"

Kou, who saw the secret of the bag, stalked Miss Shiroyama from that day.

To be done! Moreover, Miss Shiroyama came to the room of Heng's dormitory with a mysterious black girl who came out of her bag ── !?