Calligraphy-experienced high school girls clash in the finals of the Koshinen Kokoro Regional Championship! With their natural Kokoro and wrist strength, they switch their brushes to dicks and compete in embarrassing erotic calligraphy performances. They get naked in front of the audience and use a huge brush as tall as themselves, showing off their calligraphy skills while being observed in every inch of their naked bodies! They insert a brush with a toy attached into their pussy and write dirty words while reacting with twitches, or mix the semen they extracted from a blowjob into chalk liquid and write a sign on a board with semen instead of water.