Chihayafuru: Chuugakusei-hen

The manga adapts Yui Tokiumi's spinoff novel series for Yuki Suetsugu's Chihayafuru manga.

The novels feature a series of stories detailing various characters' lives in middle school. (The original manga begins when they are in elementary school and skips to high school.)

(Source: Anime News Network & Be-Love issue 21)