Because in this episode, Sanrio characters My Melody and Kuromi show up for two reasons, 1, to advertise the new series featuring them on Netflix, and 2, to advertise the second wave of Sanrio Collab Aipri Cards (Mitsuki and Himari are dressed as Kuromi and My Melody respectfully) Also, if this got an English dub, someone needs to tell the production company to skip this episode, because of advertising.