√終了の祝い絵。
どんな絵を描くの悩んでいる時に浮かぶどんな絵を描くの悩んでいる常磐の絵だ。

A celebratory illustration for finishing her route.
This is a picture of Tokiwa struggling to decide what to draw, a picture that came to my mind when I was struggling to decide what to draw.