Asakusa wants to create ''the greatest world'' in anime through her imaginative images... but there''s so much more to a world than pictures, so now the Eizouken trio has become a quartet as their newest recruit, Doumeki, sole member of Shibahama High''s Sound Club, leads them on a new adventure into the wild to harvest ambient audio! And even as Kanamori tries to find a route for them through the minefield of social media, Mizusaki and Asakusa are going to have to meet the fans in person at a local convention...