One-shot by KaguraBachi's mangaka, unrelated to main series.
Alternaive Title : Knitting by the Window
Ota-kun is being bullied. Yamagishi-san, who sits in front of him, can't bear to see it and starts exchanging letters with him. Ota-kun decides to give Yamagishi-san a hand-knitted bracelet as a birthday present, but...!?