Continuation of Dokonjougaeru series.

Not every orphan would love living at St. Morwald's Home for Children, but Earwig does. She gets whatever she wants, whenever she wants it, and it's been that way since she was dropped on the orphanage doorstep as a baby. But all that changes the day Bella Yaga and the Mandrake come to St. Morwald's, disguised as foster parents. Earwig is whisked off to their mysterious house full of invisible rooms, potions, and spell books, with magic around every corner. Most children would run in terror from a house like that... but not Earwig. Using her own cleverness—with a lot of help from a talking cat—she decides to show the witch who's boss.

Fifth season of Strike the Blood.

At a CD store, Ichika Hoshino hears a song by Miku that she has never heard before. On the monitor, she sees a "Hatsune Miku" in a form she has never seen before, and couldn't help say it out loud, "Miku!?" Miku was surprised at the voice, her eyes meet Ichika's, but she disappears shortly after. Later, after a live performance on the street, the Miku that Ichika saw before appears on her smartphone. Miku looks sad and downcast, and when Ichika quietly asks Miku about her story, she tells Ichika that there are people to whom she wants to deliver her songs, but no matter how much she sings, her songs are not reaching them. Miku, who saw Ichika singing to the hearts of many people at her live performances, thought that if she learns more about Ichika, she can do the same, and came to Ichika. Ichika smiles at Miku and says, "If it's all right with me." And a new story of Hatsune Miku and the boys and girls begins—.