Ookina Noichi to Chiisana Hinayuki

Tanda Nao is filled with concern because his cherished childhood friend Hinayuki has been hanging around with a classmate he doesn't trust: Noichi. Hinayuki is petite, delicate, and docile, while Noichi is big, quiet, and rough... Nao is worried because he doesn't know why they are together!? Could it be that these two are in some kind of relationship...!?

(Source: MU)

Included one-shot: Kyoudai Extra