Megumi Jinno, the class representative for Sagiri’s class, shows up at the Izumi residence with no prior warning. Her mission is to "take Sagiri to school". How will Sagiri and Masamune handle the situation? Afterwards, Masamune runs into a mystical fairy in a pink dress…

Masamune comes home from his trip, and Sagiri is happy to see him return. They now await their new novel to go on sale. On the day of, an “Izumi Masamune Faire” is held in a store in Akihabara. While Masamune and Sagiri “explore” the area, they share their stories of how they got into writing novels and illustrating.

Masamune and Sagiri’s new work, "Sekaimo: The World’s Cutest Little Sister" is now on sale. Sagiri continues to stream from her room wearing a mask as always, and declares the curtain rising on a "Festival".